4After they seized Peter, they put him in prison. They arranged for four groups of soldiers to guard Peter. Each group had four soldiers. Every three hours a different group began to guard him while the others rested. Herod wanted to bring Peter out of prison and judge him in front of the Jewish people after the Passover Festival was finished. He then planned to command soldiers to execute Peter.
5So for several days Peter was kept {they kept Peter} in prison. But the other believers in the congregation at Jerusalem were praying earnestly to God that he would help Peter.
Acts 12
Acts 12:4-5