Deuteronomy 21:14-16

New King James Version

¹⁴ And it shall be, if you have no delight in her, then you shall set her free, but you certainly shall not sell her for money; you shall not treat her brutally, because you have ^(A)humbled her.

Firstborn Inheritance Rights

¹⁵ “If a man has two wives, one loved ^(B)and the other unloved, and they have borne him children, both the loved and the unloved, and if the firstborn son is of her who is unloved, ¹⁶ then it shall be, ^(C)on the day he bequeaths his possessions to his sons, that he must not bestow firstborn status on the son of the loved wife in preference to the son of the unloved, the true firstborn.