Then the tribune commanded that the apostle be brought into the fortress. In order to learn precisely of what he was guilty, he wished to subject him to torture.
Paul had already been stretched out with straps for this purpose. But he appealed to the protection of his rank as a Roman citizen, which he possessed by birth. This saved him from undeserved blows.
When the tribune learned that Paul was a Roman citizen, he was afraid even because he had bound him (v. 29). Nevertheless, wishing to know reliably what the Jews accused him of, he did not release him.
On the next day he freed him from the bonds and ordered the chief priests and the Sanhedrin to assemble. Then he brought Paul out of the fortress and set him before them (v. 30).