1 Samuel 12:16-18

Now therefore stand still and see this great thing, which Jehovah will do before your eyes. Is it not wheat harvest to-day? I will call unto Jehovah, that he may send thunder and rain; and ye shall know and see that your wickedness is great, which ye have done in the sight of Jehovah, in asking you a king. So Samuel called unto Jehovah; and Jehovah sent thunder and rain that day: and all the people greatly feared Jehovah and Samuel.