Acts 12:1-6

Now about that time Herod the king laid hands on some who belonged to the church in order to mistreat them. And he had James the brother of John put to death with a sword. When he saw that it pleased the Jews, he proceeded to arrest Peter also. Now it was during the days of Unleavened Bread. When he had seized him, he put him in prison, delivering him to four squads of soldiers to guard him, intending after the Passover to bring him out before the people. So Peter was kept in the prison, but prayer for him was being made fervently by the church to God. On the very night when Herod was about to bring him forward, Peter was sleeping between two soldiers, bound with two chains, and guards in front of the door were watching over the prison.