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Expiation of a Crime
10“When you go out to battle against your enemies, and the 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 shave her head and trim her nails. 13She shall also remove the clothes of her captivity and shall remain in your house, and weep 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. 14But it shall be, if you are not pleased with her, then you shall let her go wherever she wishes; and you certainly shall not sell her for money, you shall not treat her as merchandise, since you have humiliated her.
Deuteronomy 21:10-14 (NASB)