Acts 16:25-27

Paul and Silas, undaunted, prayed in the middle of the night and sang songs of praise to God, while all the other prisoners listened to their worship. Suddenly, a great earthquake shook the foundations of the prison. All at once every prison door flung open and the chains of all the prisoners came loose. Startled, the jailer awoke and saw every cell door standing open. Assuming that all the prisoners had escaped, he drew his sword and was about to kill himself