Deuteronomy 7:1-2, 22-23

“When the LORD your God brings you into the land you are about to enter and occupy, he will clear away many nations ahead of you: the Hittites, Girgashites, Amorites, Canaanites, Perizzites, Hivites, and Jebusites. These seven nations are greater and more numerous than you. When the LORD your God hands these nations over to you and you conquer them, you must completely destroy them. Make no treaties with them and show them no mercy.

The LORD your God will drive those nations out ahead of you little by little. You will not clear them away all at once, otherwise the wild animals would multiply too quickly for you. But the LORD your God will hand them over to you. He will throw them into complete confusion until they are destroyed.