"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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"And these are the generations of Isaac the son of Abraham; Abraham fathered Isaac" (Genesis 25:19). There are children who are embarrassed of their parents, and there are parents who are embarrassed by their children. With Abraham and Isaac it wasn't like that: Isaac prided himself in that he was "Isaac the son of Abraham," and Abraham prided himself in that "Abraham fathered Isaac"
–Midrash Tanchuma
The Parshah