Deuteronomy 9:4-5

4“Do not think in your heart, after the Lord your God has cast them out before you, saying, ‘Because of my righteousness the Lord has brought me in to possess this land’; but it is because of the wickedness of these nations that the Lord is driving them out from before you.

5It is not because of your righteousness or the uprightness of your heart that you go in to possess their land, but because of the wickedness of these nations that the Lord your God drives them out from before you, and that He may fulfill the word which the Lord swore to your fathers, to Abraham, Isaac, and Jacob.