Deuteronomy 11:13-17

13And it shall come to pass, if ye shall hearken diligently to my commandments which I command you this day, to love the LORD your God, and to serve him with all your heart and with all your soul, 14That I will give you the rain of your land in its due season, the former rain and the latter rain, that thou mayest gather in thy grain, and thy wine, and thy oil. 15And I will give grass in thy fields for thy cattle, that thou mayest eat and be full.1 16Take heed to yourselves, that your heart be not deceived, and ye turn aside, and serve other gods, and worship them; 17And then the LORD’S wrath shall be kindled against you, and he shall shut up the heaven, that there shall be no rain, and the land shall not yield its fruit; and lest ye perish quickly from off the good land which the LORD giveth you.