1 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 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.”

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.

Then the LORD came and stood and called as at the previous times, “Samuel! Samuel!” Then Samuel answered, “Speak, for Your servant is listening.”