Deuteronomy 21:10-13

10“Suppose you go out to war against your enemies and the Lord your God hands them over to you, and you take some of them as captives.

11And suppose you see among the captives a beautiful woman, and you are attracted to her and want to marry her.

12If this happens, you may take her to your home, where she must shave her head, cut her nails,

13and change the clothes she was wearing when she was captured. She will stay in your home, but let her mourn for her father and mother for a full month. Then you may marry her, and you will be her husband and she will be your wife.