Deuteronomy 21:10-13

10When 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, 11And thou seest among the captives a beautiful woman, and hast a desire to her, that thou wouldest have her for thy wife; 12Then thou shalt bring her home to thy house; and she shall shave her head, and pare her nails;1 13And 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.