Deuteronomy 9:3-4

9:3 Understand today that the Lord your God who goes before you is a devouring fire; he will defeat and subdue them before you. You will dispossess and destroy them quickly just as he has told you. 9:4 Do not think to yourself after the Lord your God has driven them out before you, “Because of my own righteousness the Lord has brought me here to possess this land.” It is because of the wickedness of these nations that the Lord is driving them out ahead of you.