Deuteronomy 21:11-13

New International Version - UK

¹¹ if you notice among the captives a beautiful woman and are attracted to her, you may take her as your wife. ¹² Bring her into your home and make her shave her head, trim her nails ¹³ and put aside the clothes she was wearing when captured. After she has lived in your house and mourned her father and mother for a full month, then you may go to her and be her husband and she shall be your wife.