Acts 16:24-26 ▼

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

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

26 suddenly 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.