Deuteronomy 11:13-17

13"And if you will indeed obey my commandments that I command you today, to love the Lord your God, and to serve him with all your heart and with all your soul,

14he will give the rain for your land in its season, the early rain and the later rain, that you may gather in your grain and your wine and your oil.

15And he will give grass in your fields for your livestock, and you shall eat and be full.

16Take care lest your heart be deceived, and you turn aside and serve other gods and worship them;

17then the anger of the Lord will be kindled against you, and he will shut up the heavens, so that there will be no rain, and the land will yield no fruit, and you will perish quickly off the good land that the Lord is giving you.