Deuteronomy 21:14-16

Modern English Version

¹⁴ It will be, if you are not pleased with her, then you must let her go wherever she pleases, but you may not sell her at all for money, nor are you to make merchandise of her, because you have humbled her.

The Right of the Firstborn

¹⁵ If a man has two wives, one beloved and another unloved, and both have borne him children, both the loved one and the unloved one, and if the firstborn son is hers that is unloved, ¹⁶ then it must be, when he gives his sons the inheritance which he has, that he may not make the firstborn son of the loved come before the son of the unloved, who was indeed the firstborn.