Deuteronomy 20:14-16

Revised Standard Version

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. ¹⁶ But in the cities of these peoples that the Lord your God gives you for an inheritance, you shall save alive nothing that breathes,