1 Samuel 3:4

3:3 and before the lamp of God went out in the tabernacle of the LORD where the ark of God was, and while Samuel was lying down,

3:4 that the LORD called Samuel. And he answered, "Here I am!"

3:5 So he ran to Eli and said, "Here I am, for you called me." And he said, "I did not call; lie down again." And he went and lay down.