Deuteronomy 20:13-15

Revised Standard Version

¹³ and when the Lord your God gives it into your hand you shall put all its males to the sword, ¹⁴ but the women and the little ones, the cattle, and everything else in the city, all its spoil, you shall take as booty for yourselves; and you shall enjoy the spoil of your enemies, which the Lord your God has given you. ¹⁵ Thus you shall do to all the cities which are very far from you, which are not cities of the nations here.