Deuteronomy 9:4-5

4Speak not thou in thy heart, after that the LORD thy God hath cast them out from before thee, saying, For my righteousness the LORD hath brought me in to possess this land: but for the wickedness of these nations the LORD doth drive them out from before thee.

5Not for thy righteousness, or for the uprightness of thy heart, dost thou go to possess their land: but for the wickedness of these nations the LORD thy God doth drive them out from before thee, and that he may perform the word which the LORD swore to thy fathers, Abraham, Isaac, and Jacob.