The liberation of the apostle Peter is an event described in the Acts of the Apostles, chapter 12 in which the apostle Peter is rescued from prison by an angel. Although described in a short textual passage, the tale has given rise to theological discussions and has been the subject of a number of artworks.
Acts 12:3–19 says that Peter was put into prison by King Herod, but the night before his trial an angel appeared to him, and told him to leave. Peter's chains fell off, and he followed the angel out of prison, thinking it was a vision (verse 9). The prison doors opened of their own accord, and the angel led Peter into the city.
When the angel suddenly left him, Peter came to himself and returned to the house of Mary, the mother of John Mark. A servant girl called Rhoda came to answer the door, and when she heard Peter's voice she was so overjoyed that she rushed to tell the others, and forgot to open the door for Peter (verse 14). Eventually Peter is let in and describes "how the Lord had brought him out of prison" (verse 17). When his escape is discovered, Herod orders the guards put to death.