Acts 12:6-7

6On that very night before Herod was going to bring him out for trial, Peter was sleeping between two soldiers, bound with two chains, while guards in front of the door were keeping watch over the prison.

7Suddenly an angel of the Lord appeared, and a light shone in the prison cell. He struck Peter on the side and woke him up, saying, “Get up quickly!” And the chains fell off Peter’s wrists.