"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].
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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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G-d's words to Adam, "Where are you?" (Genesis 3:9) is G‑d's call to every man, every moment of time. Where are you in the world? -- G‑d calls -- What have you accomplished? You have been allotted a certain number of days, hours, and minutes in which to fulfill your mission in life. You have lived so many years and so many days, hours and minutes. Where are you? What have you achieved?
–Rabbi Schneur Zalman of Liadi