Deuteronomy 20:16-18

New Revised Standard Version, Anglicised Catholic Edition

¹⁶ But as for the towns of these peoples that the Lord your God is giving you as an inheritance, you must not let anything that breathes remain alive. ¹⁷ You shall annihilate them—the Hittites and the Amorites, the Canaanites and the Perizzites, the Hivites and the Jebusites—just as the Lord your God has commanded, ¹⁸ so that they may not teach you to do all the abhorrent things that they do for their gods, and you thus sin against the Lord your God.