Chapter 12, verses 6-9
6
The same night when Herod was about to bring him out, Peter was sleeping between two soldiers, bound with two chains. Guards in front of the door kept the prison.
7
And behold, an angel of the Lord stood by him, and a light shone in the cell. He struck Peter on the side, and woke him up, saying, “Stand up quickly!” His chains fell off from his hands.
8
The angel said to him, “Get dressed and put on your sandals.” He did so. He said to him, “Put on your cloak, and follow me.”
9
And he went out and followed him. He didn’t know that what was being done by the angel was real, but thought he saw a vision.