8 So the Lord called a third time, and once more Samuel got up and went to Eli. "Here I am. Did you call me?" 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, 'Speak, Lord, your servant is listening.'" So Samuel went back to bed.
Matthew Henry's Commentary on 1 Samuel 3:8-9
Commentary on 1 Samuel 3:1-10
(Read 1 Samuel 3:1-10)
The call which Divine grace designs shall be made effectual; will be repeated till it is so, till we come to the call. Eli, perceiving that it was the voice of God that Samuel heard, instructed him what to say. Though it was a disgrace to Eli, for God's call to be directed to Samuel, yet he told him how to meet it. Thus the elder should do their utmost to assist and improve the younger that are rising up. Let us never fail to teach those who are coming after us, even such as will soon be preferred before us, John 1:30. Good words should be put into children's mouths betimes, by which they may be prepared to learn Divine things, and be trained up to regard them.