Acts 12:14-16

14 And when she knew Peter's voice, she opened not the gate for gladness, but ran in, and told how Peter stood before the gate.
15 And they said unto her, Thou art mad. But she constantly affirmed that it was even so. Then said they, It is his angel.
16 But Peter continued knocking: and when they had opened the door, and saw him, they were astonished.