Deuteronomy 29:24-26

And all the nations shall say: Why hath the Lord done thus to this land? what meaneth this exceeding great heat of his wrath?

And they shall answer: Because they forsook the covenant of the Lord, which he made with their fathers, when he brought them out of the land of Egypt:

And they have served strange gods, and adored them, whom they knew not, and for whom they had not been assigned: