Acts 12:1-5

1Now about that time Herod the king stretched out his hand to harass some from the church.

2Then he killed James the brother of John with the sword.

3And because he saw that it pleased the Jews, he proceeded further to seize Peter also. Now it was during the Days of Unleavened Bread.

4So 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.

5Peter was therefore kept in prison, but constant prayer was offered to God for him by the church.