Deuteronomy 20:10-15

10“As you approach a town to attack it, you must first offer its people terms for peace.

11If they accept your terms and open the gates to you, then all the people inside will serve you in forced labor.

12But if they refuse to make peace and prepare to fight, you must attack the town.

13When the Lord your God hands the town over to you, use your swords to kill every man in the town.

14But you may keep for yourselves all the women, children, livestock, and other plunder. You may enjoy the plunder from your enemies that the Lord your God has given you.

15“But these instructions apply only to distant towns, not to the towns of the nations in the land you will enter.