Deuteronomy 20:16, 17
Deuteronomy 20:16 NIV
However, in the cities of the nations the LORD your God is giving you as an inheritance, do not leave alive anything that breathes.
Deuteronomy 20:17 NIV
Completely destroy them—the Hittites, Amorites, Canaanites, Perizzites, Hivites and Jebusites—as the LORD your God has commanded you.