'Forming' in the Bible

But the Jews were filled with jealousy and, taking along some worthless men from the rabble in the marketplace and forming a mob, threw the city into an uproar. And attacking Jason's house, they were looking for them to bring [them] out to the popular assembly.

and going on board a ship of Adramyttium which was about to sail to the ports of the province of Asia, we put to sea; Aristarchus, the Macedonian, from Thessalonica, forming one of our party.