"You shall not do any work with the firstborn of your ox"—Deuteronomy 15:19.
It is forbidden to do work with an animal designated for sacrifice [e.g., to use the animal to plow or to transport a load].
ב"ה
Daily Mitzvah (Rambam)
Day 177: Negative Commandment 113
From the Sichos in English Collection
Negative Commandment 113 (Digest)
Doing Work with Animal Designated for Sacrifice
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Therefore man was created a single individual: to teach us that whoever destroys a single life, it is as if he destroyed the entire world; and whoever sustains a single life, it is as if he sustained the entire world
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