Acts 12:4-6

After his arrest Peter was put in jail, where he was handed over to be guarded by four groups of four soldiers each. Herod planned to put him on trial in public after Passover. So Peter was kept in jail, but the people of the church were praying earnestly to God for him. The night before Herod was going to bring him out to the people, Peter was sleeping between two guards. He was tied with two chains, and there were guards on duty at the prison gate.