Deuteronomy 20:16-18

YLT(i) 16 `Only, of the cities of these peoples which Jehovah thy God is giving to thee for an inheritance, thou dost not keep alive any breathing; 17 for thou dost certainly devote the Hittite, and the Amorite, the Canaanite, and the Perizzite, the Hivite, and the Jebusite, as Jehovah thy God hath commanded thee, 18 so that they teach you not to do according to all their abominations which they have done to their gods, and ye have sinned against Jehovah your God.