1 Samuel 3:7-9 NLT

7 Samuel did not yet know the LORD because he had never had a message from the LORD before.
8 So now the LORD called a third time, and once more Samuel jumped up and ran to Eli. "Here I am," he said. "What do you need?" Then Eli realized it was the LORD who was calling the boy.
9 So he said to Samuel, "Go and lie down again, and if someone calls again, say, 'Yes, LORD, your servant is listening.'" So Samuel went back to bed.