Positive Commandment 181 (Digest)
The Decapitated Calf
"If one is found slain in the land"—Deuteronomy 21:1.
If the corpse of a murdered individual is found lying in the field, and the killer remains unknown, the courts must decapitate a calf [as per the procedure described in the Book of Deuteronomy].
The 181st mitzvah is that we are commanded regarding the eglah arufah (calf that is decapitated), in a case where a murder victim is found in a field and we don't know who the murderer was.
The source of this commandment is G‑d's statement (exalted be He), "When a corpse is found fallen in the field...." This is the law of eglah arufah.
The details of this mitzvah are explained in the last chapter of tractate Sotah.
Negative Commandment 309 (Digest)
Working the Land near "the Stream of the Decapitated Calf"
The 309th prohibition is that we are forbidden from sowing or working [the land around] the 'strong river' where the calf is decapitated.
The source of this prohibition is G‑d's statement, "[The elders of that city shall bring the calf to a swiftly flowing stream, the land around which] must never be worked or sown."
The punishment for this prohibition is lashes. In the enumeration of transgressions which are punished by lashes in tractate Makkos, our Sages said, "But you omitted one who sows the land around the 'strong river' — which is prohibited by the verse, 'It must never be worked or sown!' " This shows that there is one prohibition and that it is punishable by lashes.
The details of this mitzvah are explained in the end of tractate Sotah.
Negative Commandment 298 (Digest)
Removing Hazards
"You shall not bring blood upon your house"—Deuteronomy 22:8.
We must not leave unattended hazards and pitfalls in our cities and homes.
The 298th prohibition is that we are forbidden from leaving obstacles or dangerous objects in our land and in our houses, in order not to endanger people.
The source of this prohibition is G‑d's statement (exalted be He), "Do not place blood in your house."
In the words of the Sifri, "The phrase 'You must place a guard-rail' constitutes a positive commandment; and the phrase 'Do not place blood' constitutes a prohibition."
The details of this mitzvah are explained in the beginning of tractate Shekalim in the Jerusalem Talmud and in a number of passages in Seder Nezikin.
Positive Commandment 184 (Digest)
Removing Sources of Danger from our Property
"You shall place a guard-rail around your roof"—Deuteronomy 22:8.
We are commanded to remove all dangers and hazards from our property. This includes constructing protective guard-rails on the perimeters of roofs and wells, so that no one falls from them or in them. The same applies to all areas of potential danger—we must fix them so that they don't pose any danger.
The 184th mitzvah is that we are commanded to remove obstacles and dangerous objects from our dwellings, i.e., to build walls surrounding roofs, wells, trenches, etc. in order to prevent people from falling into them or from them. The same applies to all dangerous places — they should be built and repaired in a way that prevents any danger.
The source of this commandment is G‑d's statement, "[When you build a new house] you must place a guard-rail around your roof."
In the words of the Sifri "The phrase 'You must place a guard-rail' constitutes a positive commandment."
The details of this mitzvah are explained in tractate Bava Kama.
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