Acts 12:4-6

4After the arrest, he put him in prison and assigned four squads of four soldiers each to guard him, intending to bring him out to the people after the Passover.

5So Peter was kept in prison, but the church was praying fervently to God for him.

6When Herod was about to bring him out for trial, that very night Peter, bound with two chains, was sleeping between two soldiers, while the sentries in front of the door guarded the prison.