Acts 16:23-25

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;