Deuteronomy 21:15

Laws Concerning Children

21:15 Suppose a man has two wives, one whom he loves more than the other, and they both bear him sons, with the firstborn being the child of the less loved wife.

Deuteronomy 22:13

Purity in the Marriage Relationship

22:13 Suppose a man marries a woman, has sexual relations with her, and then rejects her,

Exodus 21:10

21:10 If he takes another wife, he must not diminish the first one’s food, her clothing, or her marital rights.