1 Samuel 3:2-12

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. So Eli said to Samuel, “Go, lie down, and it shall be that if He calls you, you shall say, ‘Speak, LORD, for Your servant is listening.’ ” So Samuel went and lay down in his place. Then the LORD came and stood and called as at the previous times, “Samuel! Samuel!” Then Samuel answered, “Speak, for Your servant is listening.” The LORD said to Samuel, “Behold, I am about to do a thing in Israel at which both ears of everyone who hears it will ring. On that day I will carry out against Eli everything that I have spoken concerning his house (family), from beginning to end.