Deuteronomy 29:24-26

24“All nations would say, ‘Why has the Lord done so to this land? What does the heat of this great anger mean?’

25Then people would say: ‘Because they have forsaken the covenant of the Lord God of their fathers, which He made with them when He brought them out of the land of Egypt;

26for they went and served other gods and worshiped them, gods that they did not know and that He had not given to them.