Deuteronomy 21:14-16

Evangelical Heritage Version

¹⁴ Then if you are no longer pleased with her, you are to let her go as she desires. You must not sell her for money. You are not to deal with her as a slave,^[a] because you have humiliated her.

Family Law

¹⁵ If a man has two wives, and one is loved and one is not loved, and both the loved one and the unloved one have borne children for him, and the firstborn son belongs to the unloved wife, ¹⁶ then on the day that he bequeaths what he owns to his sons, he cannot declare the son of the loved wife as his firstborn in preference to the son of the unloved wife, who is the true firstborn.