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Daily Mitzvah

Day 121: Negative Commandment 217, 218

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Negative Commandment 217 (Digest)
Interbreeding Animals

"You shall not let your cattle breed with a different kind"Leviticus 19:19.

It is forbidden to breed together two different animal species.

Negative Commandment 218 (Digest)
Working with Two Animal Species

"You shall not plow with an ox and donkey together"Deuteronomy 22:10.

It is forbidden to cause animals of two species to work together, e.g., to have them jointly plow, thresh or pull a wagon.

Biblically, this prohibition only applies if one of the animals is kosher (e.g., an ox) and the other of a non-kosher species (e.g., a donkey). The Sages, however, extended this prohibition to apply to any two species.

Translation of (the unabridged text of) Sefer Hamitzvot by Rabbi Berel Bell, member of the Rabbinical Court of Montreal and director of Teacher Training for the Jewish Learning Institute.

From "Sefer Hamitzvot in English," published by Sichos in English.
Daily Quote
Just like in the case of two people who are wrestling... if one of them moves with sloth and lethargy, he will be easily defeated and felled, even if he is stronger than his fellow; so, too, in battling one's evil inclination, one can prevail over it ... only with alacrity that comes from joy and from a heart that is free and cleansed from every trace of worry and sadness...
  –Rabbi Schneur Zalman of Liadi
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