Dt 20:12-17 (King James)

¹² And if it will make no peace with thee, but will make war against thee, then thou shalt besiege it:
¹³ And when the LORD thy God hath delivered it into thine hands, thou shalt smite every male thereof with the edge of the sword:
¹⁴ But the women, and the little ones, and the cattle, and all that is in the city, even all the spoil thereof, shalt thou take unto thyself; and thou shalt eat the spoil of thine enemies, which the LORD thy God hath given thee.
¹⁵ Thus shalt thou do unto all the cities which are very far off from thee, which are not of the cities of these nations.
¹⁶ But of the cities of these people, which the LORD thy God doth give thee for an inheritance, thou shalt save alive nothing that breatheth:
¹⁷ But thou shalt utterly destroy them; namely, the Hittites, and the Amorites, the Canaanites, and the Perizzites, the Hivites, and the Jebusites; as the LORD thy God hath commanded thee: