Deuteronomy 20:13-18

13And when the LORD thy God hath delivered it into thy hands, thou shalt smite every male of it with the edge of the sword: 14But the women, and the little ones, and the cattle, and all that is in the city, even all the spoil of it, shalt thou take to thyself; and thou shalt eat the spoil of thy enemies, which the LORD thy God hath given thee.1 15Thus shalt thou do to all the cities which are very distant from thee, which are not of the cities of these nations. 16But of the cities of these people, which the LORD thy God doth give thee for an inheritance, thou shalt save alive nothing that breatheth: 17But 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: 18That they may not teach you to do after all their abominations, which they have done to their gods; so should ye sin against the LORD your God.