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Rambam - 3 Chapters a Day

Mikvaot - Chapter 5, Mikvaot - Chapter 6, Mikvaot - Chapter 7

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Mikvaot - Chapter 5

1

When three lugim of drawn water fall into a mikveh - whether from one k'li or from two or three keilim - they can be combined to reach a quantity that disqualifies the mikveh, provided the water begins descending from the second before it concludes descending from the first. If descends from four keilim, the water from them is not combined.

When does the above apply? When one did not intend to increase the amount of water in the mikveh. If, however, one intended to increase the amount of water in the mikveh, even if a dinar-size measure was added each year, they are all combined to reach the sum of three lugim, whether the drawn water was present there before the acceptable water, the acceptable water was present there before the drawn water, or they both fell into the mikveh at the same time. Since three lugim of water fell into 40 se'ah combining with the acceptable water to reach that amount or into less than 40 se'ah of water, the entire amount is invalidated and considered as drawn.

א

מִקְוְה שֶׁנָּפְלוּ אֵלָיו שְׁלֹשָׁה לוֹגִין מַיִם שְׁאוּבִין מִכְּלִי אֶחָד אוֹ מִשְּׁנַיִם וּשְׁלֹשָׁה כֵּלִים מִצְטָרְפִין וְהוּא שֶׁיַּתְחִיל הַשֵּׁנִי עַד שֶׁלֹּא פָּסַק הָרִאשׁוֹן. מֵאַרְבָּעָה כֵּלִים אֵין מִצְטָרְפִין. בַּמֶּה דְּבָרִים אֲמוּרִים בִּזְמַן שֶׁלֹּא נִתְכַּוֵּן לְרַבּוֹת. אֲבָל אִם נִתְכַּוֵּן לְרַבּוֹת אֶת מֵי הַמִּקְוֶה אֲפִלּוּ נָפַל מִשְׁקַל דִּינָר בְּכָל שָׁנָה מִצְטָרֵף לִשְׁלֹשָׁה לוֹגִין בֵּין שֶׁקָּדְמוּ הַשְּׁאוּבִים אֶת הַכְּשֵׁרִים בֵּין שֶׁקָּדְמוּ הַכְּשֵׁרִים אֶת הַשְּׁאוּבִים אוֹ שֶׁנָּפְלוּ שְׁתֵּיהֶן כְּאַחַת. כֵּיוָן שֶׁנָּפְלוּ שְׁלֹשָׁה לוֹגִין שְׁאוּבִין לְתוֹךְ אַרְבָּעִים סְאָה [קֹדֶם שֶׁנָּפְלוּ בּוֹ אַרְבָּעִים סְאָה אוֹ לְפָחוֹת מֵאַרְבָּעִים] נִפְסַל הַכּל וְנַעֲשָׂה שָׁאוּב:

2

When two people each poured a log and a half into a mikveh, or one wrung out his garment and lifted it up, causing the water it contained to fall from several places, it invalidates a mikveh. A similar ruling applies when one pours from a distributor that causes water to pour from several places at the same time.

ב

שְׁנַיִם שֶׁהֵטִילוּ זֶה לוֹג וּמֶחֱצָה וְזֶה לוֹג וּמֶחֱצָה. וְהַסּוֹחֵט כְּסוּתוֹ וְהִגְבִּיהָהּ וְהַמַּיִם שֶׁבָּהּ נוֹפְלִין מִמְּקוֹמוֹת הַרְבֵּה. וְכֵן הַמְעָרֶה מִן הַצַּרְצוּר שֶׁמֵּטִיל מִמְּקוֹמוֹת הַרְבֵּה הֲרֵי אֵלּוּ פּוֹסְלִין:

3

When one immerses a pillow or a cushion of leather into a mikveh that has exactly 40 se'ah, when he lifts their edges out of the water, the water inside of them is considered as drawn water.

What should he do? He should immerse them and lift them up by their ends. With regard to a basket and a sack, he should immerse them and lift them up in the ordinary manner without showing any concern.

ג

הַמַּטְבִּיל כַּר אוֹ כֶּסֶת שֶׁל עוֹר בְּמִקְוֶה שֶׁיֵּשׁ בּוֹ אַרְבָּעִים סְאָה מְכֻוָּנוֹת כֵּיוָן שֶׁהִגְבִּיהַּ שִׂפְתוֹתֵיהֶן מִן הַמַּיִם נִמְצְאוּ הַמַּיִם שֶׁבְּתוֹכָן שְׁאוּבִין. כֵּיצַד יַעֲשֶׂה. מַטְבִּילָן וּמַעֲלָן דֶּרֶךְ שׁוּלֵיהֶן. אֲבָל הַקֻּפָּה וְהַשַּׂק מַטְבִּילָן וּמַעֲלָן כְּדַרְכָּן וְאֵינוֹ חוֹשֵׁשׁ:

4

The following law applies to a mikveh that had three pockets of drawn water with a log in each of the pockets and then acceptable water fell into it. If it is known that 40 se'ah of acceptable water fell into it before the water reached the third pocket, it is acceptable, If not, it is disqualified.

ד

מִקְוֶה שֶׁיֵּשׁ בּוֹ שָׁלֹשׁ גּוּמוֹת מִמַּיִם שְׁאוּבִין לוֹג בְּכָל גּוּמָא וְנָפְלוּ לְתוֹכוֹ מַיִם כְּשֵׁרִים אִם יָדוּעַ שֶׁנָּפַל לְתוֹכוֹ אַרְבָּעִים סְאָה מַיִם כְּשֵׁרִים עַד שֶׁלֹּא יַגִּיעוּ לַגּוּמָא הַשְּׁלִישִׁית כָּשֵׁר וְאִם לָאו פָּסוּל:

5

When there are two mikveot, neither containing 40 se'ah, a log and a half fell into each one of them, and then the mikveot became mixed together, they are acceptable. The rationale is that neither one of them had been designated as unacceptable.

If, by contrast, three lugim of drawn water fell into a mikveh that does not contain 40 se'ah [of acceptable water and afterwards, it was divided into two, even though enough acceptable water was added to each one to constitute an acceptable mikveh, they are invalid. The rationale is that whenever a mikveh is disqualified, all of its contents are considered as drawn water. It is as if all of the water had been drawn with a container.

ה

שְׁנֵי מִקְוָאוֹת אֵין בְּכָל אֶחָד מֵהֶן אַרְבָּעִים סְאָה וְנָפַל לָזֶה לוֹג וּמֶחֱצָה וְלָזֶה לוֹג וּמֶחֱצָה וְנִתְעָרְבוּ שְׁנֵי הַמִּקְוָאוֹת הֲרֵי אֵלּוּ כְּשֵׁרִין מִפְּנֵי שֶׁלֹּא נִקְרָא עַל אֶחָד מֵהֶן שֵׁם פָּסוּל. אֲבָל מִקְוֶה שֶׁאֵין בּוֹ אַרְבָּעִים סְאָה שֶׁנָּפַל לְתוֹכוֹ שְׁלֹשָׁה לוֹגִין מַיִם שְׁאוּבִין וְאַחַר כָּךְ נֶחְלָק לִשְׁנַיִם וְרִבָּה מַיִם כְּשֵׁרִים עַל כָּל אֶחָד מֵהֶן הֲרֵי אֵלּוּ פְּסוּלִין שֶׁכָּל הַמִּקְוֶה כֻּלּוֹ שֶׁנִּפְסַל כְּמַיִם שְׁאוּבִין הוּא חָשׁוּב וּכְאִלּוּ כָּל מֵימָיו נִשְׁאֲבוּ בִּכְלִי:

6

When a cistern is filled with drawn water and a canal of rainwater flows into it and out of it, it is still considered as unacceptable until it can be calculated that not even three lugim of the drawn water that originally was in the cistern remain.

When three lugim of unacceptable water fall into a mikveh containing less than 40 se'ah of acceptable water, all of its contents are disqualified. Even if afterwards, he added enough acceptable water until the measure of 40 se'ah is reached, the mikveh remains invalid until all the water that was contained within it flows out and less than three lugim of the drawn water remain.

What is implied? A mikveh contains 20 se'ah of rainwater and a se'ah of drawn water fell into it. Afterwards, more acceptable water was added to it. It remains unacceptable until one knows that the 20 se'ah it originally contained and more than five and a quarter kabbin of the added water flowed out and less than three lugim of the entire quantity remain. Similarly, if one made a mikveh that contains 40 se'ah of acceptable water and joined it to this invalid mikveh, the acceptable water purifies the unacceptable water.

ו

בּוֹר שֶׁהוּא מָלֵא מַיִם שְׁאוּבִים וְהָאַמָּה נִכְנֶסֶת לוֹ וְיוֹצֵאת מִמֶּנּוּ לְעוֹלָם הוּא בְּפִסּוּלוֹ עַד שֶׁתְּחַשֵּׁב שֶׁלֹּא נִשְׁאֲרוּ מִן הַשְּׁאוּבִין שֶׁהָיוּ בַּבּוֹר שְׁלֹשָׁה לוֹגִין. מִקְוֶה שֶׁנָּפַל לְתוֹכוֹ מַיִם שְׁאוּבִין וְנִפְסַל וְאַחַר כָּךְ רִבָּה עָלָיו מַיִם כְּשֵׁרִים עַד שֶׁנִּמְצְאוּ הַכְּשֵׁרִים אַרְבָּעִים סְאָה הֲרֵי הוּא בְּפִסּוּלוֹ עַד שֶׁיֵּצְאוּ כָּל הַמַּיִם שֶׁהָיוּ בְּתוֹכוֹ וְיִפְחֲתוּ הַשְּׁאוּבִין מִשְּׁלֹשָׁה לוֹגִין. כֵּיצַד. מִקְוֶה שֶׁיֵּשׁ בּוֹ עֶשְׂרִים סְאָה מֵי גְּשָׁמִים וְנָפַל לְתוֹכוֹ סְאָה מַיִם שְׁאוּבִים וְאַחַר כָּךְ הִרְבָּה עָלָיו מַיִם כְּשֵׁרִים. הֲרֵי זֶה בְּפִסּוּלוֹ עַד שֶׁיֵּדַע שֶׁיָּצְאוּ מִמֶּנּוּ עֶשְׂרִים סְאָה שֶׁהָיוּ בּוֹ וַחֲמִשָּׁה קַבִּין וְיוֹתֵר מֵרְבִיעַ הַקַּב וְלֹא נִשְׁאַר מִן הַכּל שֶׁנִּפְסַל חוּץ מִפָּחוֹת מִשְּׁלֹשָׁה לוֹגִין. וְכֵן אִם עָשָׂה מִקְוֶה שֶׁיֵּשׁ בּוֹ אַרְבָּעִים סְאָה מַיִם כְּשֵׁרִים וְעֵרְבוֹ עִם הַמִּקְוֶה הַזֶּה הַפָּסוּל טִהֲרוּ אֵלּוּ אֶת אֵלּוּ:

7

If one was moving mud from the bottom of the mikveh to the sides and, as a result, three lugim of water flowed into the mikveh, it remains acceptable. If one was removing the mud and lifted it up by hand, separating it from the mikveh and placing it on the mikveh's sides and three lugim flowed into the mikveh from it, they disqualify it.

ז

הַמְסַלֵּק אֶת הַטִּיט לַצְּדָדִים וְנִמְשְׁכוּ מִמֶּנּוּ שְׁלֹשָׁה לוֹגִים לַמִּקְוֶה הֲרֵי זֶה כָּשֵׁר. הָיָה תּוֹלֵשׁ הַטִּיט וּמַגְבִּיהוֹ בְּיָדוֹ וְהִבְדִּילוֹ מִן הַמִּקְוֶה לְצִדָּהּ וְנִמְשְׁכוּ מִמֶּנּוּ שְׁלֹשָׁה לוֹגִין הֲרֵי אֵלּוּ פּוֹסְלִין:

8

When a legion is passing from one place to another - or similarly, an animal is passing from one place to another - and three lugim of water was splashed into a mikveh by their hands and feet, it is acceptable. Moreover, even if they made a mikveh in this manner initially, it is acceptable.

ח

גַּיִס הָעוֹבֵר מִמָּקוֹם לְמָקוֹם וְכֵן בְּהֵמָה הָעוֹבֶרֶת מִמָּקוֹם לְמָקוֹם וְזָלְפוּ בִּידֵיהֶן וּבְרַגְלֵיהֶם שְׁלֹשָׁה לוֹגִין לַמִּקְוֶה הֲרֵי זֶה כָּשֵׁר. וְלֹא עוֹד אֶלָּא אֲפִלּוּ עָשׂוּ מִקְוֶה בַּתְּחִלָּה הֲרֵי זֶה כָּשֵׁר:

9

When a mikveh does not contain 40 se'ah and less than three lugim of impure, drawn water fell into it, the water is acceptable with regard to challah and terumah and one may use it for the ritual washing of hands. It is, however, invalid to be used as the base for the collection of water for an acceptable mikveh. If rainwater descended upon it to the extent that the rainwater constituted the majority of the mixture, the mixture is acceptable to be used as the base for the collection of water for an acceptable mikveh.

When three lugim of impure, drawn water fell into it, the water is unacceptable for challah and terumah. One may not use it for the ritual washing of hands, nor may it be used as the base for the collection of water for an acceptable mikveh. If rainwater descended upon it to the extent that the rainwater constituted the majority of the mixture, the mixture is acceptable with regard to challah and terumah and one may use it for the ritual washing of hands. It is, however, invalid to be used as the base for the collection of water for an acceptable mikveh until all of the original water that became considered as drawn flowed out and less than three lugim of it remained.

Similarly, if there was a mikveh that contained only a dinar-size measure less than 40 se'ah and three lugim of impure, drawn water fell into it, the water is unacceptable for challah and terumah. One may not use it for the ritual washing of hands, nor may it be used as the base for the collection of water for an acceptable mikveh. If less than three lugim of water fell into it - even if the water was all impure - and then a dinar-size measure of rainwater fell into it, causing it comprise a complete measure of 40 se'ah, it is acceptable. Just as it is considered as pure with regard to immersion, it is considered pure in every respect.

ט

מִקְוֶה שֶׁאֵין בּוֹ אַרְבָּעִים סְאָה וְנָפַל לְתוֹכוֹ פָּחוֹת מִשְּׁלֹשָׁה לוֹגִין מַיִם טְמֵאִין שְׁאוּבִין הֲרֵי זֶה כָּשֵׁר לְחַלָּה וְלִתְרוּמָה וְלִטּל מֵהֶן לַיָּדַיִם. וּפְסוּלִין לְהַקְווֹת עֲלֵיהֶן. יָרְדוּ עֲלֵיהֶן גְּשָׁמִים וְרַבּוּ עֲלֵיהֶן הֲרֵי אֵלּוּ כְּשֵׁרִים לְהַקְווֹת עֲלֵיהֶם. נָפַל לְתוֹכוֹ שְׁלֹשָׁה לוֹגִין מַיִם שְׁאוּבִין טְמֵאִים הֲרֵי זֶה פָּסוּל לְחַלָּה וְלִתְרוּמָה וְלִטּל מִמֶּנּוּ לַיָּדַיִם. וּפְסוּלִין לְהַקְווֹת עָלָיו. יָרְדוּ גְּשָׁמִים וְרַבּוּ עֲלֵיהֶן הֲרֵי הֵן כְּשֵׁרִין לְחַלָּה וְלִתְרוּמָה וְלִטּל מֵהֶן לַיָּדַיִם וּפְסוּלִין לְהַקְווֹת עֲלֵיהֶן עַד שֶׁיֵּצְאוּ כָּל הַמַּיִם הָרִאשׁוֹנִים שֶׁנַּעֲשׂוּ כֻּלָּן כִּשְׁאוּבִין וְלֹא יִשָּׁאֵר מֵהֶן אֶלָּא פָּחוֹת מִשְּׁלֹשָׁה לוֹגִין. וְכֵן מִקְוֶה שֶׁיֵּשׁ בּוֹ אַרְבָּעִים סְאָה חָסֵר דִּינָר וְנָפְלוּ לְתוֹכוֹ שְׁלֹשָׁה לוֹגִין מַיִם שְׁאוּבִין טְמֵאִין הֲרֵי זֶה פָּסוּל לְחַלָּה וְלִתְרוּמָה וְלִטּל מִמֶּנּוּ לַיָּדַיִם וּפְסוּלִין לְהַקְווֹת עֲלֵיהֶן. נָפַל לְתוֹכוֹ פָּחוֹת מִשְּׁלֹשָׁה לוֹגִין מַיִם אֲפִלּוּ כֻּלָּן טְמֵאִין וְאַחַר כָּךְ נָפְלוּ לְתוֹכוֹ מִשְׁקַל דִּינָר מֵי גְּשָׁמִים שֶׁהִשְׁלִימוּ כָּשֵׁר. כְּשֵׁם שֶׁטָּהוֹר לִטְבִילָה כָּךְ טָהוֹר לְכָל דָּבָר:

Mikvaot - Chapter 6

1

Whenever water passes over keilim that contain a receptacle or water falls into them, it is considered as drawn water and disqualifies a mikveh, provided that the receptacle was made to serve that purpose. Even containers that are not susceptible to ritual impurity, e.g., stone containers and containers made from earth, disqualify water.

א

כָּל הַכֵּלִים הַמְקַבְּלִין שֶׁהָלְכוּ הַמַּיִם עֲלֵיהֶן אוֹ שֶׁנָּפְלוּ מִתּוֹכָן הֲרֵי אֵלּוּ שְׁאוּבִין וּפוֹסְלִין אֶת הַמִּקְוֶה. וְהוּא שֶׁיֵּעָשׂוּ לְקַבָּלָה. אֲפִלּוּ הָיוּ כֵּלִים שֶׁאֵין מְקַבְּלִין טֻמְאָה כְּגוֹן כְּלֵי אֲבָנִים וּכְלֵי אֲדָמָה הֲרֵי אֵלּוּ פּוֹסְלִין:

2

Whenever a k'li was not made with the intent that it serve as a receptacle, even though it does serve as a receptacle, the water it contains does not disqualify a mikveh, for example, large pipes through which water flows. Even though they are wide in the middle and serve as receptacles, the water they contain does not disqualify a mikveh. This applies whether they were made of metal or of earthenware.

ב

כָּל כְּלִי שֶׁלֹּא נַעֲשָׂה לְקַבָּלָה אַף עַל פִּי שֶׁהוּא מְקַבֵּל אֵינוֹ פּוֹסֵל אֶת הַמִּקְוֶה. כְּגוֹן הַסִּילוֹנוֹת שֶׁהַמַּיִם נִמְשָׁכִין מֵהֶן אַף עַל פִּי שֶׁהֵן רְחָבִים בְּאֶמְצַע וּמְקַבְּלִין אֵין פּוֹסְלִין אֶת הַמִּקְוֶה בֵּין שֶׁהָיוּ שֶׁל מַתֶּכֶת אוֹ שֶׁל חֶרֶס:

3

The water contained in a trough in a stone does not disqualify a mikveh, because the trough is not a k'li. If, however, one joins a k'li to a stone, water contained in it disqualifies a mikveh, even if it was joined with cement. If one made a hole from below or one as wide as the mouthpiece of a drinking pouch in the trough from the side, it is acceptable and water contained within it does not disqualify a mikveh.

ג

הַשֹּׁקֶת שֶׁבַּסֶּלַע אֵינוֹ פּוֹסֵל אֶת הַמִּקְוֶה לְפִי שֶׁאֵינָהּ כְּלִי. אֲבָל כְּלִי שֶׁחִבְּרוֹ בַּסֶּלַע פּוֹסֵל אֶת הַמִּקְוֶה אַף עַל פִּי שֶׁחִבְּרוֹ בְּסִיד. נִקְּבָה מִלְּמַטָּה אוֹ מִן הַצַּד כִּשְׁפוֹפֶרֶת הַנּוֹד כְּשֵׁרָה וְאֵינָהּ פּוֹסֶלֶת אֶת הַמִּקְוֶה:

4

When a person takes a large barrel or a large kneading trough and makes a hole large enough to purify it from susceptibility to impurity, and then permanently affixes it within the ground, making it into a mikveh, it is acceptable. Similarly, if one plugged the hole with lime and with building materials, this does not disqualify the barrel and the water collected within forms an acceptable mikveh. If one plugged it with lime or with gypsum, the water it contains makes a mikveh unacceptable, unless it was permanently affixed to the earth or made part of a building. If it was taken and placed on the surface of the earth or on lime and mud was smeared on its sides, it is acceptable to use as a mikveh.

ד

הַלּוֹקֵחַ כְּלִי גָּדוֹל כְּגוֹן חָבִית גְּדוֹלָה אוֹ עֲרֵבָה גְּדוֹלָה וְנִקְּבוֹ נֶקֶב הַמְטַהֲרוֹ וּקְבָעוֹ בָּאָרֶץ וַעֲשָׂאָהוּ מִקְוֶה הֲרֵי זֶה כָּשֵׁר. וְכֵן אִם פָּקַק אֶת הַנֶּקֶב בְּסִיד וּבְבִנְיָן אֵינוֹ פּוֹסֵל וְהַמַּיִם הַנִּקְוִין בְּתוֹכוֹ מִקְוֶה כָּשֵׁר. סְתָמוֹ בְּסִיד אוֹ בְּגִפְּסִיס עֲדַיִן הוּא פּוֹסֵל אֶת הַמִּקְוֶה עַד שֶׁיִּקְבָּעֶנּוּ בָּאָרֶץ אוֹ יִבְנֶה. וְאִם הוֹלִיכוֹ עַל גַּב הָאָרֶץ וְעַל גַּב הַסִּיד וּמֵרֵחַ בְּטִיט מִן הַצְּדָדִין הֲרֵי זֶה כָּשֵׁר:

5

The following laws apply when one places a tablet under a drainage pipe and water flows over it into a mikveh. If the tablet had borders on its sides, this water would disqualify the mikveh. If not, it does not disqualify it. If one stood the tablet upright on its point, at an angle under the drainage pipe to wash it, even though it has borders, it does not disqualify the water, because in this position, it was not intended to serve as a receptacle.

ה

הַמַּנִּיחַ טַבְלָא תַּחַת הַצִּנּוֹר וַהֲרֵי הַמַּיִם נִמְשָׁכִין עַל הַטַּבְלָא וְיוֹרְדִין לַמִּקְוֶה אִם הָיָה לַטַּבְלָא דֹּפֶן הֲרֵי זוֹ פּוֹסֶלֶת אֶת הַמִּקְוֶה וְאִם לָאו אֵינָהּ פּוֹסֶלֶת. זְקָפָהּ תַּחַת הַצִּנּוֹר כְּדֵי לַהֲדִיחָהּ אַף עַל פִּי שֶׁיֵּשׁ לָהּ דֹּפֶן אֵינָהּ פּוֹסֶלֶת שֶׁהֲרֵי לֹא עֲשָׂאָהּ לְקַבֵּל:

6

The following laws apply when one carves a place in a pipe for pebbles that are carried with the water to collect so that they will not descend together with the water. If it was a wooden pipe and he carved out even the slightest hollow, it disqualifies the water, because all of the water passes through a utensil that was made to serve as a receptacle. This applies even if one permanently affixed the pipe to the earth after he carved out the hollow. The rationale is that the pipe had already been considered as a k'li when it was unattached. If, by contrast, it was permanently affixed to the earth and then he carved out the receptacle, it does not disqualify the water. If the pipe was made from earthenware, it does not disqualify the water unless the hollow is large enough to contain a revi'it.

Even though the hollow in the pipe becomes filled with the pebbles that dribble into it, it remains a disqualifying factor. It is not considered as having been stopped up. If earth or pebbles descended into the hollow and stopped it up, because they were compressed there, the water is acceptable.

ו

הַחוֹטֵט בְּצִנּוֹר מָקוֹם לְקַבֵּל בּוֹ הַצְּרוֹרוֹת הַמִּתְגַּלְגְּלִין בַּמַּיִם כְּדֵי שֶׁלֹּא יֵרְדוּ עִם הַמַּיִם אִם הָיָה הַצִּנּוֹר שֶׁל עֵץ וְחָפַר בּוֹ כָּל שֶׁהוּא פּוֹסֵל שֶׁהֲרֵי כָּל הַמַּיִם שֶׁיּוֹרְדִין בָּאִין מִתּוֹךְ כְּלִי שֶׁנַּעֲשָׂה לְקַבָּלָה. וַאֲפִלּוּ שֶׁקְּבָעוֹ אַחַר שֶׁחָקַק בּוֹ הוֹאִיל וְהָיָה עָלָיו תּוֹרַת כְּלִי כְּשֶׁהָיָה תָּלוּשׁ. אֲבָל אִם קְבָעוֹ בַּקַּרְקַע וְאַחַר כָּךְ חָקַק בּוֹ בֵּית קִבּוּל אֵינוֹ פּוֹסֵל. וְאִם הָיָה צִנּוֹר שֶׁל חֶרֶס אֵינוֹ פּוֹסֵל עַד שֶׁיִּהְיֶה בַּחֲקָק כְּדֵי לְקַבֵּל רְבִיעִית. אַף עַל פִּי שֶׁנִּתְמַלֵּא הַמָּקוֹם הֶחָקוּק שֶׁבַּצִּנּוֹר צְרוֹרוֹת הַמִּתְחַלְחֲלִין בְּתוֹכוֹ הֲרֵי הוּא בְּפִסּוּלוֹ וְאֵינוֹ כְּסָתוּם. יָרַד לְתוֹךְ הַמָּקוֹם שֶׁחָקַק עָפָר אוֹ צְרוֹרוֹת וּסְתָמוֹ וְנִכְבַּשׁ הֲרֵי זֶה כָּשֵׁר:

7

When either a sponge or a bucket that contains three lugim of drawn water falls into a mikveh, it does not disqualify it. For it was said only that three lugim of water that fall into it disqualify it, not a container into which drawn water had fallen.

ז

הַסְּפוֹג וְהַדְּלִי שֶׁהָיוּ בָּהֶן שְׁלֹשֶׁת לוֹגִין מַיִם וְנָפְלוּ לַמִּקְוֶה לֹא פְּסָלוּהוּ שֶׁלֹּא אָמְרוּ אֶלָּא שְׁלֹשֶׁת לוֹגִין שֶׁנָּפְלוּ לֹא כְּלִי שֶׁנָּפְלוּ בּוֹ מַיִם שְׁאוּבִין:

8

When there is a closet or a chest in the sea, one may not immerse in them unless they have a hole the size of the mouthpiece of a drinking pouch. If there was a sack or a basket in the sea, one may immerse in them. Similarly, if one places a sack or a basket under a drainage pipe, the water that flows through them does not disqualify a mikveh.

ח

הַשִּׁדָּה וְהַתֵּבָה שֶׁבַּיָּם אֵין מַטְבִּילִין בָּהֶן אֶלָּא אִם כֵּן הָיוּ נְקוּבִים כִּשְׁפוֹפֶרֶת הַנּוֹד. וְאִם הָיוּ שַׂק אוֹ קֻפָּה מַטְבִּילִין בָּהֶן. וְכֵן הַמַּנִּיחַ שַׂק אוֹ קֻפָּה תַּחַת הַצִּנּוֹר אֵין הַמַּיִם הַנִּמְשָׁכִין מֵהֶן פּוֹסְלִין אֶת הַמִּקְוֶה:

9

When one immersed keilim over an impure base for a container that was placed inside a mikveh, even though the edge of the base extends above the water, the keilim are purified from their impurity. If, however, one lifts them up from the water into the inner space of the base, the water that is on the keilim contracts impurity because it is within the inner space of the base. The water in turn imparts impurity to the keilim.

Similarly, if a spring emerges from under an earthenware oven and a person descended and immersed in it, he is pure, but his hands contract impurity from the inner space of the oven unless the water extends above the oven for at least the height of his hands. Thus when he immersed, his hands will be above the oven. The difficulties arise, because earthenware keilim do not regain purity through immersion in a mikveh, as we explained.

ט

גִּסְטְרָא טְמֵאָה שֶׁהִיא בְּתוֹךְ הַמִּקְוֶה וּשְׂפָתָהּ לְמַעְלָה מִן הַמַּיִם וְהִטְבִּיל בָּהּ הַכֵּלִים טִהֲרוּ מִטֻּמְאָתָן. אֲבָל כְּשֶׁיַּגְבִּיהֵם מִן הַמַּיִם עַד שֶׁהֵן בָּאֲוִיר הַגִּסְטְרָא מִתְטַמֵּא הַמַּיִם שֶׁעַל גַּבָּן מֵאֲוִיר הַגִּסְטְרָא וְחוֹזֵר וּמְטַמֵּא אוֹתָן. וְכֵן מַעְיָן הַיּוֹצֵא מִתַּחַת הַתַּנּוּר הַטָּמֵא וְיָרַד וְטָבַל בְּתוֹכוֹ הוּא טָהוֹר וְיָדָיו טְמֵאוֹת מֵאֲוִיר הַתַּנּוּר אֶלָּא אִם כֵּן הָיוּ הַמַּיִם לְמַעְלָה מִן הַתַּנּוּר כְּרוּם יָדָיו שֶׁנִּמְצָא כְּשֶׁטָּבַל יָדָיו לְמַעְלָה מִן הַתַּנּוּר שֶׁאֵין כְּלֵי חֶרֶס מִתְטַהֲרִין בְּמִקְוֶה כְּמוֹ שֶׁבֵּאַרְנוּ:

10

When a barrel full of water falls into a sea, even into the Mediterranean Sea, one who immerses there is not considered to have immersed. The rationale is that it is impossible that there will not be three lugim of water from the barrel in one place. If a loaf of terumah falls there, it becomes impure. It contracts impurity due to contact with drawn water, for the water is standing there. If such a situation would take place in a river or the like, one would be able to immerse there, since it flows.

י

חָבִית מְלֵאָה מַיִם שֶׁנָּפְלָה לַיָּם אֲפִלּוּ לַיָּם הַגָּדוֹל הַטּוֹבֵל שָׁם לֹא עָלְתָה לוֹ טְבִילָה. אִי אֶפְשָׁר לִשְׁלֹשָׁה לוֹגִין שֶׁלֹּא יִהְיוּ בְּמָקוֹם אֶחָד. וְכִכָּר שֶׁל תְּרוּמָה שֶׁנָּפַל לְשָׁם נִטְמָא בַּמַּיִם הַשְּׁאוּבִין שֶׁהֲרֵי הַמַּיִם עוֹמְדִין שָׁם. אֲבָל הַנְּהָרוֹת וְכַיּוֹצֵא בָּהֶן הוֹאִיל וְהֵם נִמְשָׁכִין הֲרֵי זֶה טוֹבֵל שָׁם:

11

When there was a pool of drawn water next to a mikveh that contains less than 40 seah, even though it is touching the water of the mikveh, it does not disqualify it, because it is like a mikveh next to a mikveh. If the pool of the drawn water was in the middle of the mikveh, it disqualifies it.

יא

מַיִם שְׁאוּבִין שֶׁהָיוּ בְּצַד הַמִּקְוֶה אַף עַל פִּי שֶׁהַמַּיִם נוֹגְעִין בְּמֵי הַמִּקְוֶה לֹא פְּסָלוּהוּ מִפְּנֵי שֶׁהֵן כְּמִקְוֶה סָמוּךְ לְמִקְוֶה. הָיוּ הַשְּׁאוּבִין בָּאֶמְצַע פּוֹסְלִין אֶת הַמִּקְוֶה:

12

The following rule applies when there are two pools of water, one above the other, they are separated by a wall, and the upper one is filled with acceptable water, but the lower one is filled with drawn water, and there is a hole in the wall between the upper pool and the lower one. If there are three lugim of drawn water opposite the hole, the upper pool is disqualified. The rationale is that it is considered as if the hole was in the center of the upper pool, not at its side.

יב

שְׁתֵּי בְּרֵכוֹת זוֹ לְמַעְלָה מִזּוֹ וְכֹתֶל בֵּינֵיהֶן וְהָעֶלְיוֹנָה מְלֵאָה מַיִם כְּשֵׁרִים וְהַתַּחְתּוֹנָה מְלֵאָה מַיִם שְׁאוּבִין וְנֶקֶב בַּכֹּתֶל שֶׁבֵּין הָעֶלְיוֹנָה לַתַּחְתּוֹנָה. אִם יֵשׁ כְּנֶגֶד הַנֶּקֶב שְׁלֹשָׁה לוֹגִין מַיִם שְׁאוּבִין נִפְסְלָה הָעֶלְיוֹנָה מִפְּנֵי שֶׁהַנֶּקֶב כְּאִלּוּ הוּא בְּאֶמְצַע הָעֶלְיוֹנָה לֹא בְּצִדָּהּ:

13

How large must the hole be for there to be three lugim there? Everything depends on the quantity of water contained in the pool. If the lower pool contains 40 se'ah, the hole must be 1/320th of the pool. If the pool contains 20 se'ah, the hole must be 1/160th of the pool. Continue calculating according to this ratio for other amounts. A se'ah is six kabbin, a kab is four lugim, and a log is the size of six eggs.

יג

כַּמָּה יִהְיֶה בַּנֶּקֶב וְיִהְיֶה בּוֹ שְׁלֹשָׁה לוֹגִין הַכּל לְפִי הַבְּרֵכָה. אִם הָיְתָה הַבְּרֵכָה הַתַּחְתּוֹנָה אַרְבָּעִים סְאָה צָרִיךְ שֶׁיִּהְיֶה הַנֶּקֶב אֶחָד מִשְּׁלֹשׁ מֵאוֹת וְעֶשְׂרִים לַבְּרֵכָה. הָיְתָה עֶשְׂרִים סְאָה צָרִיךְ לִהְיוֹת הַנֶּקֶב אֶחָד מִמֵּאָה וְשִׁשִּׁים לַבְּרֵכָה. וְצֵא וַחֲשֹׁב לְפִי חֶשְׁבּוֹן זֶה. שֶׁהַסְּאָה שִׁשָּׁה קַבִּין וְהַקַּב אַרְבָּעָה לוֹגִין וְהַלּוֹג שֵׁשׁ בֵּיצִים:

14

The following laws apply when there are three mikveot, each containing exactly 20 se'ah, next to each other, and one [of those on the side contained drawn water. If three people descended and immersed themselves, causing all the water to rise and mix on the floor outside the mikveot, both the mikveot and the people who immersed themselves are pure. The rationale is that the entire amount totaled 60 se'ah, of which 40 se'ah of acceptable water came from two pools located next to each other. And drawn water does not disqualify a mikveh that contains 40 se'ah, as we explained.

If the pool containing drawn water was in the middle and they descended and immersed themselves, causing the water to rise and the mikveot thus to become joined, the status of the mikveot is the same as it was previously and those who immersed themselves are impure as they were previously. The rationale is that 40 se'ah of acceptable water did not mix together, because their pools were not located next to each other, for the pool of drawn water separates between them.

יד

שְׁלֹשָׁה מִקְוָאוֹת זֶה בְּצַד זֶה בְּכָל אֶחָד מֵהֶן עֶשְׂרִים סְאָה מְכֻוָּנוֹת וְאֶחָד מֵהֶן שָׁאוּב מִן הַצַּד וְיָרְדוּ שְׁלֹשָׁה וְטָבְלוּ שְׁלָשְׁתָּן וְנֶעֶרְמוּ הַמַּיִם מִכֻּלָּן וְנִתְעָרְבוּ מִלְּמַעְלָה. הַמִּקְוָאוֹת כְּשֵׁרִים וְהַטּוֹבְלִים טְהוֹרִים שֶׁהֲרֵי נַעֲשָׂה הַכּל שִׁשִּׁים סְאָה מֵהֶן אַרְבָּעִים כְּשֵׁרִים זֶה בְּצַד זֶה וְאֵין הַמַּיִם הַשְּׁאוּבִים פּוֹסְלִין מִקְוֶה שֶׁיֵּשׁ בּוֹ אַרְבָּעִים סְאָה כְּמוֹ שֶׁבֵּאַרְנוּ. הָיָה הַשָּׁאוּב בְּאֶמְצַע וְיָרְדוּ וְטָבְלוּ בָּהֶן וְנֶעֶרְמוּ הַמַּיִם וְנִתְעָרְבוּ הַמִּקְוָאוֹת. הֲרֵי הַמִּקְוָאוֹת כְּשֶׁהָיוּ וְהַטּוֹבְלִין טְמֵאִין כְּשֶׁהָיוּ שֶׁהֲרֵי לֹא נִתְעָרְבוּ אַרְבָּעִים סְאָה הַכְּשֵׁרִין לְפִי שֶׁאֵינָן זֶה בְּצַד זֶה שֶׁהַשָּׁאוּב מַבְדִּיל בֵּינֵיהֶן:

Mikvaot - Chapter 7

1

A mikveh is not disqualified, neither because of a change of its water's taste, nor a change of its smell, only because its color changes. Any substance that may not be used to constitute a mikveh initially disqualifies one, if it causes its color to change.

What is implied? Wine, milk, blood, or other liquids that are classified as fruit juices do not disqualify a mikveh if three lugim of them fall into it, because it was only said that three lugim of drawn water disqualify a mikveh. They do, however, disqualify it if they change the color of its water.

Even when a mikveh contains 100 se'ah and a log of wine or fruit juice falls into it and changes its color, it is unacceptable. Similarly, if a mikveh contains 20 se'ah or less of acceptable water and a se'ah of wine or fruit juice fell into it without changing its color, the water is acceptable as it was beforehand. The se'ah of wine or fruit juice, however, is not counted in the measure of the mikveh. If another 20 se'ah of acceptable water were added to the original 20, it is an acceptable mikveh.

א

אֵין הַמִּקְוֶה נִפְסָל לֹא בְּשִׁנּוּי הַטַּעַם וְלֹא בְּשִׁנּוּי הָרֵיחַ אֶלָּא בְּשִׁנּוּי מַרְאֶה בִּלְבַד. וְכָל דָּבָר שֶׁאֵין עוֹשִׂין בּוֹ מִקְוֶה לְכַתְּחִלָּה פּוֹסֵל אֶת הַמִּקְוֶה בְּשִׁנּוּי מַרְאֶה. כֵּיצַד. הַיַּיִן אוֹ הֶחָלָב וְהַדָּם וְכַיּוֹצֵא בָּהֶן מִמֵּי כָּל הַפֵּרוֹת אֵינָן פּוֹסְלִין אֶת הַמִּקְוֶה בִּשְׁלֹשָׁה לוֹגִין שֶׁלֹּא אָמְרוּ אֶלָּא מַיִם שְׁאוּבִין. וּפוֹסְלִין בְּשִׁנּוּי מַרְאֶה אֲפִלּוּ מִקְוֶה שֶׁיֵּשׁ בּוֹ מֵאָה סְאָה וְנָפַל לוֹ לוֹג יַיִן אוֹ מֵי פֵּרוֹת וְשִׁנָּה אֶת מַרְאָיו פָּסוּל. וְכֵן מִקְוֶה שֶׁיֵּשׁ בּוֹ עֶשְׂרִים סְאָה מַיִם כְּשֵׁרִים אוֹ פָּחוֹת מִזֶּה וְנָפַל לְתוֹכוֹ סְאָה יַיִן אוֹ מֵי פֵּרוֹת וְלֹא שִׁנּוּ אֶת מַרְאָיו הֲרֵי אֵלּוּ כְּשֵׁרִים כְּשֶׁהָיוּ. וְאֵין הַסְּאָה שֶׁנָּפְלָה עוֹלָה לְמִדַּת הַמִּקְוֶה. וְאִם נוֹסַף עַל הָעֶשְׂרִים עֶשְׂרִים אֲחֵרִים מַיִם כְּשֵׁרִים הֲרֵי זֶה מִקְוֶה כָּשֵׁר:

2

There are substances that cause a mikveh to be considered acceptable and do not disqualify it; others that disqualify it and do not cause it to be considered acceptable, and others that neither cause it to be acceptable nor disqualify it.

ב

יֵשׁ מַעֲלִין אֶת הַמִּקְוֶה וְלֹא פּוֹסְלִין פּוֹסְלִין וְלֹא מַעֲלִין לֹא מַעֲלִין וְלֹא פּוֹסְלִין:

3

These are the substances that cause a mikveh to be considered acceptable and do not disqualify it: snow, hail, sleet, ice, salt, and flowing mud. What is implied? When a mikveh contains 39 se'ah of water and a se'ah of one of these substances falls into it, the mikveh is acceptable and complete. Thus they cause a mikveh to be considered acceptable and do not disqualify it.

Even if one brought 40 se'ah of snow initially and placed them in a cavity and crushed it there, the mikveh is complete and acceptable.

ג

וְאֵלּוּ מַעֲלִין וְלֹא פּוֹסְלִין. הַשֶּׁלֶג. וְהַבָּרָד. וְהַכְּפוֹר. וְהַגְּלִיד. וְהַמֶּלַח. וְטִיט הַנֵּרוֹק. כֵּיצַד. מִקְוֶה שֶׁיֵּשׁ בּוֹ אַרְבָּעִים סְאָה חָסֵר אַחַת וְנָפַל לְתוֹכוֹ סְאָה מֵאֶחָד מֵאֵלּוּ הֲרֵי זֶה עוֹלֶה לְמִדָּתוֹ וַהֲרֵי הַמִּקְוֶה כָּשֵׁר וְשָׁלֵם. נִמְצְאוּ מַעֲלִין וְלֹא פּוֹסְלִין. אֲפִלּוּ הֵבִיא אַרְבָּעִים סְאָה שֶׁלֶג בַּתְּחִלָּה וְהִנִּיחָן בַּעֵקָּה וְרִסְּקוֹ שָׁם הֲרֵי זֶה מִקְוֶה שָׁלֵם וְכָשֵׁר:

4

These are the substances that disqualify a mikveh and never cause it to be considered acceptable: drawn water, whether pure or impure, water that was used for pickling, water that was used for cooking, a mixture of water and grape dregs before they become vinegar, and beer.

What is implied? When a mikveh contains 40 se'ah minus the weight of a dinar and the weight of a dinar of one of these liquids falls into it, it is not included in the measure of a mikveh and does not complete it. If three lugim of one of these liquids falls into a mikveh, it disqualifies it.

ד

וְאֵלּוּ פּוֹסְלִין וְלֹא מַעֲלִין. מַיִם שְׁאוּבִין בֵּין טְהוֹרִין בֵּין טְמֵאִים. וּמֵי כְּבָשִׁים. וּמֵי שְׁלָקוֹת. וְהַתֶּמֶד עַד שֶׁלֹּא הֶחְמִיץ. וְהַשֵּׁכָר. כֵּיצַד. מִקְוֶה שֶׁיֵּשׁ בּוֹ אַרְבָּעִים סְאָה חָסֵר מִשְׁקַל דִּינָר וְנָפַל מֵאֶחָד מֵאֵלּוּ מִשְׁקַל דִּינָר לְתוֹכָן אֵינוֹ עוֹלֶה לְמִדַּת הַמִּקְוֶה וְלֹא הִשְׁלִימוֹ. וְאִם נָפַל מֵאֶחָד מֵהֶן שְׁלֹשָׁה לוֹגִין מֵהֶן פּוֹסְלִין אֶת הַמִּקְוֶה:

5

These are the substances that neither disqualify a mikveh, nor cause it to be considered acceptable: other liquids, fruit juice, fish brine, fish oil, and a mixture of water and grape dregs that became vinegar.

What is implied? If there was a mikveh that contained 39 se'ah and a se'ah of these liquids fell into it, it does not cause it to be acceptable. Nevertheless, the water the mikveh contains is acceptable as it was beforehand, for these liquids disqualify a mikveh only if they change its color, as explained.

ה

וְאֵלּוּ לֹא פּוֹסְלִין וְלֹא מַעֲלִין. שְׁאָר הַמַּשְׁקִין. וּמֵי פֵּרוֹת. וְהַצִּיר. וְהַמֻּרְיָס. וְהַתֶּמֶד מִשֶּׁהֶחְמִיץ. כֵּיצַד. מִקְוֶה שֶׁיֵּשׁ בּוֹ אַרְבָּעִים סְאָה חָסֵר אֶחָד וְנָפַל מֵאֶחָד מֵאֵלּוּ סְאָה לְתוֹכָן לֹא הֶעֱלָהוּ וַהֲרֵי הַמַּיִם כְּשֵׁרִים כְּשֶׁהָיוּ שֶׁאֵין אֵלּוּ פּוֹסְלִין אֶלָּא בְּשִׁנּוּי מַרְאֶה כְּמוֹ שֶׁבֵּאַרְנוּ:

6

There are times when the latter liquids cause a mikveh to be considered as acceptable. What is implied? A mikveh contained 40 se'ah, a se'ah of these liquids fell in, and then a se'ah was removed from the mikveh's waters. The 40 se'ah that remain still constitute an acceptable mikveh.

ו

וּפְעָמִים שֶׁאֵלּוּ מַעֲלִין אֶת הַמִּקְוֶה. כֵּיצַד. מִקְוֶה שֶׁיֵּשׁ בּוֹ אַרְבָּעִים סְאָה וְנָפַל לְתוֹכוֹ סְאָה מֵאֶחָד מֵאֵלּוּ וְחָזַר וְלָקַח סְאָה מִמֶּנָּה הֲרֵי הָאַרְבָּעִים שֶׁנִּשְׁאֲרוּ מִקְוֶה כָּשֵׁר:

7

When one washed baskets used to collect olives or grapes in a mikveh, causing the water's color to change, it is acceptable.

ז

מִקְוֶה שֶׁהֵדִיחַ בּוֹ סַלֵּי זֵיתִים וַעֲנָבִים וְשִׁנּוּ אֶת מַרְאָיו כָּשֵׁר:

8

Water of dyes disqualify a mikveh if three lugim fall in, but do not disqualify it because they changed its color.

ח

מֵי הַצֶּבַע פּוֹסְלִין אֶת הַמִּקְוֶה בִּשְׁלֹשָׁה לוֹגִין. וְאֵין פּוֹסְלִין אוֹתוֹ בְּשִׁנּוּי מַרְאָיו:

9

When wine, black fluid from olives, or other fruit juices fall into a mikveh and change the color of its water, disqualifying it, how can it be rectified? If the mikveh contains less than 40 se'ah, one should wait until rain descends and changes its color back to water's natural color. If the mikveh contains 40 se'ah of acceptable water, one may fill buckets and pour water into it until its color reverts to water's natural color.

If wine, the black fluid from olives, or the like falls into a mikveh and changes the color of some of its water, if it does not have 40 se'ah of water whose color has not changed, one should not immerse in it. Even if it contains 40 se'ah, if one immerses in a place whose color has changed, his immersion is invalid. Even if a barrel of wine was broken and fell into the Mediterranean Sea and the color of the water in that place is the color of wine, one who immerses in that place is not considered to have immersed.

ט

מִקְוֶה שֶׁנָּפַל יַיִן אוֹ מֹהַל אוֹ שְׁאָר מֵי פֵּרוֹת וְשִׁנּוּ אֶת מַרְאָיו וְנִפְסַל כֵּיצַד תַּקָּנָתוֹ. יַמְתִּין עַד שֶׁיֵּרְדוּ גְּשָׁמִים וְיַחְזְרוּ מַרְאָיו לְמַרְאֵה מַיִם. וְאִם הָיָה בַּמִּקְוֶה אַרְבָּעִים סְאָה מַיִם כְּשֵׁרִים מְמַלֵּא וְשׁוֹאֵב לְתוֹכָן עַד שֶׁיַּחְזְרוּ מַרְאָיו לְמַרְאֵה מַיִם. נָפַל לְתוֹכוֹ יַיִן אוֹ מֹהַל וְכַיּוֹצֵא בָּהּ וְנִשְׁתַּנָּה מַרְאֵה מִקְצָתוֹ. אִם אֵין בָּהּ מַרְאֵה מַיִם שֶׁלֹּא נִשְׁתַּנָּה כְּדֵי אַרְבָּעִים סְאָה הֲרֵי זֶה לֹא יִטְבּל בּוֹ. וְהַטּוֹבֵל בְּמָקוֹם שֶׁנִּשְׁתַּנָּה לֹא עָלְתָה לוֹ טְבִילָה. אֲפִלּוּ חָבִית שֶׁל יַיִן שֶׁנִּשְׁבְּרָה בַּיָּם הַגָּדוֹל וּמַרְאֵה אוֹתוֹ מָקוֹם כְּמַרְאֶה שֶׁל יַיִן הַטּוֹבֵל בְּאוֹתוֹ מָקוֹם לֹא עָלְתָה לוֹ טְבִילָה:

10

When even a dinar-sized portion of wine fell into three lugim of drawn water and change their color, so that they are all the color of wine and then they fell into a mikveh they do not disqualify it, unless they change its color.

י

שְׁלֹשָׁה לוֹגִין מַיִם שְׁאוּבִין שֶׁנָּפַל לְתוֹכָן אֲפִלּוּ מִשְׁקַל דִּינָר יַיִן וְשִׁנָּה מַרְאֵיהֶן וַהֲרֵי מַרְאֵה הַכּל מַרְאֵה יַיִן וְנָפְלוּ לַמִּקְוֶה לֹא פְּסָלוּהוּ אֶלָּא אִם שִׁנּוּ אֶת מַרְאָיו:

11

When there are three lugim minus a dinar-sized portion of water and milk or fruit juice falls into the water, but its color remains that of water, it does not disqualify a mikveh if it falls into it. A mikveh is not disqualified unless three lugim of drawn water fall into it that were not mixed with any other liquid or with fruit juice.

יא

שְׁלֹשָׁה לוֹגִין חָסֵר דִּינָר מַיִם שְׁאוּבִין שֶׁנָּפַל לְתוֹכָן דִּינַר חָלָב אוֹ מֵי פֵּרוֹת וַהֲרֵי מַרְאֵה הַכּל מַיִם וְנָפְלוּ לַמִּקְוֶה לֹא פְּסָלוּהוּ עַד שֶׁיִּפְּלוּ שְׁלֹשָׁה לוֹגִין מַיִם שְׁאוּבִין שֶׁאֵין בָּהֶן תַּעֲרֹבֶת מַשְׁקֶה אַחֵר וְלֹא מֵי פֵּרוֹת:

12

When the color of a mikveh changes on its own accord without anything falling into it, it is acceptable. It is only disqualified if its color changed due to another liquid.

יב

מִקְוֶה שֶׁנִּשְׁתַּנָּה מַרְאֵה מֵימָיו מֵחֲמַת עַצְמוֹ וְלֹא נָפַל לוֹ דָּבָר הֲרֵי זֶה כָּשֵׁר. לֹא אָמְרוּ אֶלָּא שֶׁנִּשְׁתַּנָּה מֵחֲמַת מַשְׁקֶה אַחֵר:

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The Mishneh Torah was the Rambam's (Rabbi Moses ben Maimon) magnum opus, a work spanning hundreds of chapters and describing all of the laws mentioned in the Torah. To this day it is the only work that details all of Jewish observance, including those laws which are only applicable when the Holy Temple is in place. Participating in one of the annual study cycles of these laws (3 chapters/day, 1 chapter/day, or Sefer Hamitzvot) is a way we can play a small but essential part in rebuilding the final Temple.
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