1 Samuel 3:9-11

Therefore Eli said unto Samuel, Go, lie down: and it shall be, if he call thee, that thou shalt say, Speak, Jehovah; for thy servant heareth. So Samuel went and lay down in his place. And Jehovah came, and stood, and called as at other times, Samuel, Samuel. Then Samuel said, Speak; for thy servant heareth. And Jehovah said to Samuel, Behold, I will do a thing in Israel, at which both the ears of every one that heareth it shall tingle.