Acts 16:22-27

22The crowd also joined in the attack against them, and the chief magistrates tore their robes off them and ordered that Paul and Silas be beaten with rods.

23After striking them many times [with the rods], they threw them into prison, commanding the jailer to guard them securely.

24He, having received such a [strict] command, threw them into the inner prison (dungeon) and fastened their feet in the stocks [in an agonizing position].

25But about midnight when Paul and Silas were praying and singing hymns of praise to God, and the prisoners were listening to them;

26suddenly there was a great earthquake, so [powerful] that the very foundations of the prison were shaken and at once all the doors were opened and everyone’s chains were unfastened.

27When the jailer, shaken out of sleep, saw the prison doors open, he drew his sword and was about to kill himself, thinking that the prisoners had escaped.