Acts 12:2-6

And he killed James the brother of John with the sword.

And because he saw it pleased the Jews, he proceeded further to take Peter also. (Then were the days of unleavened bread.)

And when he had apprehended him, he put him in prison, and delivered him to four quaternions of soldiers to keep him; intending after Easter to bring him forth to the people.

Peter therefore was kept in prison: but prayer was made without ceasing of the church unto God for him.

And when Herod would have brought him forth, the same night Peter was sleeping between two soldiers, bound with two chains: and the keepers before the door kept the prison.