Deuteronomy 20:15-18 King James 2000 (KJ2000)

15. Thus shall you do unto all the cities which are very far off from you, which are not of the cities of these nations.

16. But of the cities of these people, which the LORD your God does give you for an inheritance, you shall save alive nothing that breathes:

17. But you shall utterly destroy them; namely, the Hittites, and the Amorites, the Canaanites, and the Perizzites, the Hivites, and the Jebusites; as the LORD your God has commanded you:

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

Deuteronomy 20