Deuteronomy 20:15-17

Amplified Bible

¹⁵ That is what you shall do to all the cities that are very far away from you, which are not among the cities of these nations nearby [which you are to dispossess]. ¹⁶ Only in the cities of these peoples that the Lord your God is giving you as an inheritance, you shall not leave alive anything that breathes. ¹⁷ But you shall utterly destroy them, the Hittite, the Amorite, the Canaanite, the Perizzite, the Hivite and the Jebusite, just as the Lord your God has commanded you,