Deuteronomy 7:1-2, 22-23

“When the LORD your God brings you into the land which you go to possess, and has cast out many nations before you, the Hittites and the Girgashites and the Amorites and the Canaanites and the Perizzites and the Hivites and the Jebusites, seven nations greater and mightier than you, and when the LORD your God delivers them over to you, you shall conquer them and utterly destroy them. You shall make no covenant with them nor show mercy to them.

And the LORD your God will drive out those nations before you little by little; you will be unable to destroy them at once, lest the beasts of the field become too numerous for you. But the LORD your God will deliver them over to you, and will inflict defeat upon them until they are destroyed.