About midnight, while Paul and Silas were praying and singing hymns to God as the prisoners listened, there was suddenly such a severe earthquake that the foundations of the jail shook; all the doors flew open, and the chains of all were pulled loose. When the jailer woke up and saw the prison doors wide open, he drew [his] sword and was about to kill himself, thinking that the prisoners had escaped. But Paul shouted out in a loud voice, “Do no harm to yourself; we are all here.” He asked for a light and rushed in and, trembling with fear, he fell down before Paul and Silas. Then he brought them out and said, “Sirs, what must I do to be saved?” (Acts 16:25-30)
St Silas; early Christian prophet and missionary, companion of St Paul the Apostle







