Deuteronomy 21:14-16

American Standard Version

¹⁴ And it shall be, if thou have no delight in her, then thou shalt let her go whither she will; but thou shalt not sell her at all for money, thou shalt not deal with her ^[a]as a slave, because thou hast humbled her.

¹⁵ If a man have two wives, the one beloved, and the other hated, and they have borne him children, both the beloved and the hated; and if the first-born son be hers that was hated; ¹⁶ then it shall be, in the day that he causeth his sons to inherit that which he hath, that he may not make the son of the beloved the first-born ^[b]before the son of the hated, who is the first-born: