I Samuel 12:16-18

“Now therefore, stand and see this great thing which the LORD will do before your eyes: Is today not the wheat harvest? I will call to the LORD, and He will send thunder and rain, that you may perceive and see that your wickedness is great, which you have done in the sight of the LORD, in asking a king for yourselves.” 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.