Deuteronomy 31:20-21

20For when I shall have brought them into the land which I swore to their fathers, that floweth with milk and honey; and they shall have eaten and filled themselves, and grew fat; then will they turn to other gods, and serve them, and provoke me, and break my covenant. 21And it shall come to pass, when many evils and troubles have befallen them, that this song shall testify against them as a witness; for it shall not be forgotten out of the mouths of their seed: for I know their imagination which they frame, even now, before I have brought them into the land which I swore.12