Deuteronomy 21:10-13

10“When you go out to battle against your enemies, and 1the Lord your God hands them over to you and you take them away captive,

11and you see among the captives a beautiful woman, and are strongly attracted to her and would take her as a wife for yourself,

12then you shall bring her into your home, and she shall 2shave her head and 3trim her nails.

13She shall also 4remove the clothes of her captivity and shall remain in your house, and 5weep for her father and mother a full month; and after that you may have relations with her and become her husband and she shall be your wife.