Deuteronomy 20:13–18

13 And when the Lord your God gives it into your hand, qyou shall put all its males to the sword, 14 rbut the women and the little ones, the livestock, and everything else in the city, all its spoil, you sshall take as plunder for yourselves. And tyou shall enjoy the spoil of your enemies, which the Lord your God has given you. 15 Thus you shall do to all the cities that are very far from you, which are not cities of the nations here. 16 But uin the cities of these peoples that the Lord your God is giving you for an inheritance, you shall save alive nothing that breathes, 17 but vyou shall devote them to complete destruction,1 the Hittites and the Amorites, the Canaanites and the Perizzites, the Hivites and the Jebusites, as the Lord your God has commanded, 18 that wthey may not teach you to do according to all their abominable practices that they have done for their gods, and so you xsin against the Lord your God.