1 Samuel 3:4-10

4that Jehovah called Samuel: and he said, Here am I. 5And he ran unto Eli, and said, Here am I; for thou calledst me. And he said, I called not; lie down again. And he went and lay down. 6And Jehovah called yet again, Samuel. And Samuel arose and went to Eli, and said, Here am I; for thou calledst me. And he answered, I called not, my son; lie down again. 7Now Samuel did not yet know Jehovah, neither was the word of Jehovah yet revealed unto him. 8And Jehovah called Samuel again the third time. And he arose and went to Eli, and said, Here am I; for thou calledst me. And Eli perceived that Jehovah had called the child. 9Therefore 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.

10And Jehovah came, and stood, and called as at other times, Samuel, Samuel. Then Samuel said, Speak; for thy servant heareth.