Samuel did not yet know the LORD because he had never had a message from the LORD before.
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.
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.
Scripture quotations marked NLT are taken from the Holy Bible, New Living Translation, copyright 1996. Used by permission of Tyndale House Publishers, Inc., Wheaton, Illinois 60189. All rights reserved. (New Living Translation - The Bible Online)