1 Samuel 12:16-18

Even now, take your stand and see this great thing which the LORD will do before your eyes. Is it not the wheat harvest today? I will call to the LORD, that He may send thunder and rain. Then you will know and see that your wickedness is great which you have done in the sight of the LORD by asking for yourselves a king.” So Samuel called to the LORD, and the LORD sent thunder and rain that day; and all the people greatly feared the LORD and Samuel.