"You shall not plow with an ox and a donkey together.
Deuteronomy 22:10
Surrounding context
22:9 "You shall not sow your vineyard with different kinds of seed, lest the yield of the seed which you have sown and the fruit of your vineyard be defiled.
22:10 "You shall not plow with an ox and a donkey together.
22:11 "You shall not wear a garment of different sorts, such as wool and linen mixed together.