Now, because the commandments were given to us by being vested in the attribute of gevurah and by the contraction of the [Divine] radiance…,
וְהִנֵּה, לְפִי שֶׁהַמִּצְוֹת נִיתְּנוּ לָנוּ עַל־יְדֵי הִתְלַבְּשׁוּת בְּמִדַּת גְּבוּרָה וְצִמְצוּם הַהֶאָרָה כוּ',
most commandments have a delimited measure.16
לָכֵן רוֹב הַמִּצְוֹת יֵשׁ לָהֶן שִׁיעוּר מְצוּמְצָם,
For instance, the length of the tzitzit must be twelve times the width of the thumb;17
כְּמוֹ: אוֹרֶךְ הַצִּיצִית י"בּ גּוּדָלִין,
the tefillin—two finger-breadths by two finger-breadths, according to the opinion of the Geonim quoted in the Alter Rebbe’s Shulchan Aruch,18 and necessarily square;19
וְהַתְּפִילִּין אֶצְבָּעַיִם עַל אֶצְבָּעַיִם וּמְרוּבָּעוֹת דַּוְקָא,
the lulav—four handbreadths;20 the Sukkah—seven handbreadths;21
וְהַלּוּלָב ד' טְפָחִים, וְהַסּוּכָּה ז' טְפָחִים,
the shofar—one handbreadth;22 and the mikveh—forty se’ahs.23
וְהַשּׁוֹפָר טֶפַח, וְהַמִּקְוֶה מ' סְאָה,
The sacrifices, too, have a delimited measure as regards age,
וְכֵן בְּקָרְבָּנוֹת יֵשׁ לָהֶן שִׁיעוּר מְצוּמְצָם לִזְמַן,
as, for instance, “sheep of one year old,”24 and “rams of two years old,”25 and “oxen….”26
כְּמוֹ כְּבָשִׂים בְּנֵי שָׁנָה, וְאֵילִים בְּנֵי שְׁתַּיִם, וּפָרִים כוּ'.
The same applies to the act of charity and to the practice of kindness with one’s money;
וְכֵן בְּמַעֲשֵׂה הַצְּדָקָה וּגְמִילוּת חֲסָדִים בְּמָמוֹנוֹ,
even though that is one of the pillars upon which the world stands,27
אַף שֶׁהִיא מֵהָעַמּוּדִים שֶׁהָעוֹלָם עוֹמֵד עֲלֵיהֶם,
as it is written: “The world is built by chesed,”28
וּכְדִכְתִיב: "עוֹלָם חֶסֶד יִבָּנֶה",
nevertheless, it has a set measure of preferably one-fifth [of one’s income],29 if one desires to perform the commandment in the best possible manner,
אֲפִילוּ הָכֵי יֵשׁ לָהּ שִׁיעוּר קָצוּב, חוֹמֶשׁ לְמִצְוָה מִן הַמּוּבְחָר,
and of one-tenth for an average measure30….
וּמַעֲשֵׂר לְמִדָּה בֵינוֹנִית כוּ'
This is what is called “the chesed of the world.”
וְזֶה נִקְרָא "חֶסֶד עוֹלָם",
This means “the chesed of G-d that endures throughout the day,”31 which is vested in the higher and lower worlds
פֵּירוּשׁ: "חֶסֶד אֵל כָּל הַיּוֹם", הַמִּתְלַבֵּשׁ בָּעוֹלָמוֹת עֶלְיוֹנִים וְתַחְתּוֹנִים,
through the arousal from below that is generated by man’s service,
עַל־יְדֵי אִתְעָרוּתָא דִלְתַתָּא,
i.e., by the precepts of charity and kindness that people practice for each other.
הִיא מִצְוַת הַצְּדָקָה וָחֶסֶד שֶׁעוֹשִׂים בְּנֵי אָדָם זֶה עִם זֶה.
Kindness between man and his fellow draws down Divine kindness into the higher and lower worlds.
However, because the world is finite and measured—
וּלְפִי שֶׁהָעוֹלָם הוּא בִּבְחִינַת גְּבוּל וּמִדָּה
“From the earth to the heavens, there is a distance of 500 years, and likewise, from one heaven to another, [there is a distance of 500 years,]”32
"מֵהָאָרֶץ עַד לָרָקִיעַ ת"ק שָׁנָה, וְכֵן מֵרָקִיעַ לְרָקִיעַ כוּ'",
and “Six thousand years shall the world exist…”33—
וְ"שִׁית אַלְפֵי שְׁנֵי הָוֵי עָלְמָא" כוּ',
the Torah’s commandment of charity and kindness is also given a limit and measure,
לָכֵן נִיתַּן שִׁיעוּר וּמִדָּה גַּם כֵּן לְמִצְוַת הַצְּדָקָה וְהַחֶסֶד שֶׁבַּתּוֹרָה
as are the other commandments of the Torah.
כְּמוֹ לִשְׁאָר מִצְוֹת הַתּוֹרָה.
I.e., the supernal degree of chesed that is drawn down through this manner of measured charity is termed chesed olam, “the chesed of the world.”