Charles Ellicott Commentary Acts 21:33

"Then the chief captain came near, and laid hold on him, and commanded him to be bound with two chains; and inquired who he was, and what he had done." — Acts 21:33 (ASV)

Commanded him to be bound with two chains.—Looking to the usual Roman practices in the treatment of prisoners, we may think of each chain as fastened at one end to the Apostle’s arm, and at the other to those of the soldiers who kept guard over him. (See Notes on Acts 12:6; Acts 28:16.) So shackled, he was taken before the Chiliarch Lysias for a preliminary inquiry.