I Samuel 3:4, 6, 8, 10

that the LORD called Samuel. And he answered, “Here I am!”

Then the LORD called yet again, “Samuel!” So Samuel arose and went to Eli, and said, “Here I am, for you called me.” He answered, “I did not call, my son; lie down again.”

And the LORD called Samuel again the third time. So he arose and went to Eli, and said, “Here I am, for you did call me.” Then Eli perceived that the LORD had called the boy.

Now the LORD came and stood and called as at other times, “Samuel! Samuel!” And Samuel answered, “Speak, for Your servant hears.”