Deuteronomy 20:16-18

King James Version

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:

¹⁸ That they teach you not to do after all their abominations, which they have done unto their gods; so should ye sin against the Lord your God.