Acts 12:7-9 ESV
And behold, an angel of the Lord stood next to him, and a light shone in the cell. He struck Peter on the side and woke him, saying, “Get up quickly.” And the chains fell off his hands. And the angel said to him, “Dress yourself and put on your sandals.” And he did so. And he said to him, “Wrap your cloak around you and follow me.” And he went out and followed him. He did not know that what was being done by the angel was real, but thought he was seeing a vision.
ESV: English Standard Version 2016