Deuteronomy 9:3-5

LXX2012(i) 3 And you shall know today, that the Lord your God he shall go before your face: he is a consuming fire; he shall destroy them, and he shall turn them back before you, and shall destroy them quickly, as the Lord said to you. 4 Speak not in your heart, when the Lord your God has destroyed these nations before your face, saying, For my righteousness the Lord brought me in to inherit this good land. 5 Not for your righteousness, nor for the holiness of your heart, do you go in to inherit their land, but because of the wickedness of these nations the Lord will destroy them from before you, and that he may establish the covenant, which the Lord sware to our fathers, to Abraam, and to Isaac, and to Jacob.