Deuteronomy 29:24-26

even all the nations shall say, Wherefore hath Jehovah done thus unto this land? what meaneth the heat of this great anger?

Then men shall say, Because they forsook the covenant of Jehovah, the God of their fathers, which he made with them when he brought them forth out of the land of Egypt,

and went and served other gods, and worshipped them, gods that they knew not, and that he had not given unto them: