Deuteronomy 7:21-23

New Century Version

²¹ Don’t be afraid of them, because the Lord your God is with you; he is a great God and people are afraid of him. ²² When the Lord your God forces those nations out of the land, he will do it little by little ahead of you. You won’t be able to destroy them all at once; otherwise, the wild animals will grow too many in number. ²³ But the Lord your God will hand those nations over to you, confusing them until they are destroyed.