D'varim (Deu) 9:5

It is not because of your righteousness, or because your heart is so upright, that you go in to take possession of their land; but to punish the wickedness of these nations that ADONAI your God is driving them out ahead of you, and also to confirm the word which ADONAI swore to your ancestors, Avraham, Yitz’chak and Ya‘akov.