1 Samuel 3:6-9

6Again the Lord called out, ‘Samuel’. So Samuel went to Eli and he said, ‘You called my name. Here I am.’ Eli answered, ‘My son, I did not call your name. Go back and lie down again.’

7Samuel did not know the Lord yet. The Lord had not spoken to him before.

8Then the Lord called Samuel's name for the third time. Samuel got up again. He went to Eli and he said, ‘You called my name. Here I am.’ Then Eli realized that it was the Lord who was calling the boy's name.

9So Eli said to Samuel, ‘Go back and lie down again. If he calls your name again, you must say, “Speak, Lord. I am your servant and I am listening.” ’ So Samuel went back and he lay down in his place.