Deuteronomy 21:10-13

10"When you go out to war against your enemies, and the Lord your God gives them into your hand and you take them captive,

11and you see among the captives a beautiful woman, and you desire to take her to be your wife,

12and you bring her home to your house, she shall shave her head and pare her nails.

13And she shall take off the clothes in which she was captured and shall remain in your house and lament her father and her mother a full month. After that you may go in to her and be her husband, and she shall be your wife.