Deuteronomy 21:12

9 So shalt thou remove the [guilt of] innocent blood from among you, when thou shalt do [that which is] right in the sight of the LORD.

10 When thou goest forth to war against thy enemies, and the LORD thy God hath delivered them into thy hands, and thou hast taken them captive,

11 And [thou] seest among the captives a beautiful woman, and hast a desire to her, that thou wouldest have her for thy wife:

12 Then thou shalt bring her home to thy house, and she shall shave her head, and pare her nails:

13 And she shall put off from her the raiment of her captivity, and shall remain in thy house, and bewail her father and her mother a full month: and after that, thou shalt go in to her, and be her husband, and she shall be thy wife.

14 And it shall be, if thou shalt 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 make merchandise of her, because thou hast humbled her.

15 If a man shall have two wives, one beloved, and another hated, and they have borne him children, [both] the beloved and the hated; and [if] the first-born son be hers that was hated: