Acts 12:3-6

³When Herod realized that he had pleased the leaders of the Jewish people by doing that, he commanded soldiers to arrest Peter in order to kill him, too. This happened during the festival when the Jewish people ate bread that did not have yeast.

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.

⁶The night before Herod planned to bring Peter out from prison to have him executed publicly, Peter was sleeping in the prison between two soldiers, with two chains binding his arms to the arms of the soldiers. Two other soldiers were guarding the prison doors.