Deuteronomy 25:4, Deuteronomy 22:10
Working animals
What is written
You shall not muzzle the ox when he treads out the grain.
Deuteronomy 25:4
You shall not plow with an ox and a donkey together.
Deuteronomy 22:10
The practical question
Both are brief, and both become live the moment a household works animals rather than machinery.
The first is an ethic of the working animal: it eats while it works. The second governs pairing. Practical questions: what counts as unequal pairing today, does it extend beyond ploughing, and how do modern harness and equipment change the picture, if at all?