1 Samuel 3:8-9

3:8 Then the Lord called Samuel a third time. So he got up and went to Eli and said, “Here I am, for you called me!” Eli then realized that it was the Lord who was calling the boy. 3:9 So Eli said to Samuel, “Go back and lie down. When he calls you, say, “Speak, Lord, for your servant is listening.” So Samuel went back and lay down in his place.