Acts 12:4-6

4When he had seized him, he put him in prison, handing him over to four squads of soldiers to guard him. Herod planned to bring him out for public trial after the Passover.

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

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.