Acts 12:3-6

3And seeing that it was pleasing to the Jews, he went on to take Peter also: (and they were the days of unleavened bread:)

4whom having seized he put in prison, having delivered him to four quaternions of soldiers to keep, purposing after the passover to bring him out to the people.

5Peter therefore was kept in the prison; but unceasing prayer was made by the assembly to 1God concerning him.

6And when Herod was going to bring him forth, that night Peter was sleeping between two soldiers, bound with two chains, and guards before the door kept the prison.