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 for the third time the Lord said Samuel's name. And he got up and went to Eli and said, Here am I; for you certainly said my name. Then it was clear to Eli that the voice which had said the child's name was the Lord's.