Deuteronomy 20:16-18

Revised Standard Version

¹⁶ But in the cities of these peoples that the Lord your God gives you for an inheritance, you shall save alive nothing that breathes, ¹⁷ but you shall utterly destroy them, the Hittites and the Amorites, the Canaanites and the Per′izzites, the Hivites and the Jeb′usites, as the Lord your God has commanded; ¹⁸ that they may not teach you to do according to all their abominable practices which they have done in the service of their gods, and so to sin against the Lord your God.