1 Samuel 3:5-9

5And he ran to Eli, and said, Here am I; for thou calledst me. And he said, I did not call: lie down again. And he went and lay down.

6And Jehovah called again, Samuel! And Samuel arose and went to Eli, and said, Here am I; for thou calledst me. And he said, I did not call, my son: lie down again.

7Now Samuel did not yet know Jehovah, neither had the word of Jehovah yet been revealed to him.

8And Jehovah called again the third time, Samuel! And he arose and went to Eli, and said, Here am I; for thou calledst me. And Eli perceived that Jehovah was calling the boy.

9And Eli said to 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.