Should have been killed of them - Was about to be killed by them. The life of Paul had been twice endangered in this manner, Acts 21:30; Acts 23:10.
With an army - With a band of soldiers, Acts 23:10.
Related Commentaries of Acts 23:27
Acts 23:27
27 This man was taken of the Jews, and should have been killed of them: then came I with an army, and rescued him, having understood that he was a Roman.