1 Samuel 3:1-8

Now the boy Samuel was attending to the service of the LORD under the supervision of Eli. The word of the LORD was rare and precious in those days; visions [that is, new revelations of divine truth] were not widespread. Yet it happened at that time, as Eli was lying down in his own place (now his eyesight had begun to grow dim and he could not see well). and the [oil] lamp of God had not yet gone out, and Samuel was lying down in the temple of the LORD, where the ark of God was, that the LORD called Samuel, and he answered, “Here I am.” He ran to Eli and said, “Here I am, for you called me.” But Eli said, “I did not call you; lie down again.” So he went and lay down. Then the LORD called yet again, “Samuel!” So Samuel got up and went to Eli and said, “Here I am, for you called me.” But Eli answered, “I did not call, my son; lie down again.” Now Samuel did not yet know [or personally experience] the LORD, and the word of the LORD was not yet revealed [directly] to him. So the LORD called Samuel a third time. And he stood and went to Eli and said, “Here I am, for you did call me.” Then Eli understood that it was the LORD [who was] calling the boy.