I Samuel 3:8

8 A third time the Lord called, "Samuel!" And Samuel got up and went to Eli and said, "Here I am; you called me." Then Eli realized that the Lord was calling the boy.

8 And 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.