Deuteronomy 21:9-11

New International Version - UK

⁹ and you will have purged from yourselves the guilt of shedding innocent blood, since you have done what is right in the eyes of the Lord.

Marrying a captive woman

¹⁰ When you go to war against your enemies and the Lord your God delivers them into your hands and you take captives, ¹¹ if you notice among the captives a beautiful woman and are attracted to her, you may take her as your wife.