Deuteronomy 20:16 in the King James Version
But of the cities of these people, which the LORD thy God doth give thee for an inheritance, thou shalt save alive nothing that breatheth:
Context
15 Thus you shall do to 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 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 Hittite, the Amorite, the Canaanite, the Perizzite, the Hivite, and the Jebusite, as the LORD your God has commanded you;