Deuteronomy 29:24-26

even all the nations will say, “Why has the LORD done thus to this land? What does the heat of this great anger mean?”

Then men will say, “Because they abandoned the covenant of the LORD, the God of their fathers, which he made with them when he brought them out of the land of Egypt,

and went and served other gods, and worshiped them, gods that they didn’t know, and that he had not given to them.