Acts 16:22-24

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].