Acts 16:20-27

and when they had brought them unto the magistrates, they said, These men, being Jews, do exceedingly trouble our city, and set forth customs which it is not lawful for us to receive, or to observe, being Romans. And the multitude rose up together against them: and the magistrates rent their garments off them, and commanded to beat them with rods. And when they had laid many stripes upon them, they cast them into prison, charging the jailor to keep them safely: who, having received such a charge, cast them into the inner prison, and made their feet fast in the stocks. But about midnight Paul and Silas were praying and singing hymns unto God, and the prisoners were listening to them; and suddenly there was a great earthquake, so that the foundations of the prison-house were shaken: and immediately all the doors were opened; and every one’s bands were loosed. And the jailor, being roused out of sleep and seeing the prison doors open, drew his sword and was about to kill himself, supposing that the prisoners had escaped.