'Break My Covenant' in the Bible

The LORD said to Moses, "Behold, you shall sleep with your fathers; and this people will rise up, and play the prostitute after the strange gods of the land, where they go to be among them, and will forsake me, and break my covenant which I have made with them.

For when I shall have brought them into the land which I swore to their fathers, flowing with milk and honey, and they shall have eaten and filled themselves, and grown fat; then will they turn to other gods, and serve them, and despise me, and break my covenant.