Deuteronomy 21:13-15

Complete Jewish Bible

¹³ and remove her prison clothing. She will stay there in your house, mourning her father and mother for a full month; after which you may go in to have sexual relations with her and be her husband, and she will be your wife. ¹⁴ In the event that you lose interest in her, you are to let her go wherever she wishes; but you may not sell her for money or treat her like a slave, because you humiliated her.

¹⁵ “If a man has two wives, the one loved and the other unloved, and both the loved and unloved wives have borne him children, and if the firstborn son is the child of the unloved wife;