Acts 12:4

12:4 When 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.

Acts 12:6

12:6 On 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.