Acts 12:1-5

Now about that time Herod the king stretched out his hand to harass some from the church. Then he killed James the brother of John with the sword. And because he saw that it pleased the Jews, he proceeded further to seize Peter also. Now it was during the Days of Unleavened Bread. So when he had arrested him, he put him in prison, and delivered him to four squads of soldiers to keep him, intending to bring him before the people after Passover. Peter was therefore kept in prison, but constant prayer was offered to God for him by the church.