Deuteronomy 11:16-17

Beware that your hearts are not deceived, and that you do not turn away [from the LORD] and serve other gods and worship them, or [else] the LORD’S anger will be kindled and burn against you, and He will shut up the heavens so that there will be no rain and the land will not yield its fruit; and you will perish quickly from the good land which the LORD is giving you.