Deuteronomy 21:9-11

New Catholic Bible

⁹ In this way you will have purged yourself of the guilt of shedding innocent blood, since you will have done what is right in the sight of the Lord.

¹⁰ Marrying a Female Captive. When you go to war against your enemies and the Lord, your God, delivers them into your hands and you take them captive, ¹¹ if you see a beautiful woman among them and you desire her, you can take her as your wife.