https://www.btstories.com/jail-break/

Barnabas and Saul arrived in Jerusalem about the time King Herod decided to persecute the Christians. He started by arresting James the brother of John. Eventually Herod had James killed. When he saw how much this pleased the Jews, he arrested Peter and had him put in prison. Sixteen soldiers guarded him. The church began praying for Peter, and didn’t stop.

The night before he was to be executed, Peter was sleeping between two guards. His hands and feet were in chains. The other guards were standing next to various doors in the prison.