Deut 21:10-14

Female Captives 10When you go out to war against your enemies, and the Lord your God hands them over to you and you take them captive,11suppose you see among the captives a beautiful woman whom you desire and want to marry,12and so you bring her home to your house: she shall shave her head, pare her nails,13discard her captive's garb, and shall remain in your house a full month, mourning for her father and mother; after that you may go in to her and be her husband, and she shall be your wife.14But if you are not satisfied with her, you shall let her go free and not sell her for money. You must not treat her as a slave, since you have dishonored her.