Cyril of Alexandria — as excerpted in the Catena Aurea on Luke 21:12-19

“Or He says this, because before that Jerusalem should be taken by the Romans, the disciples, having suffered persecution from the Jews, were imprisoned and brought before rulers; Paul was sent to Rome to Cæsar, and stood before Festus and Agrippa. It follows, And it shall turn to you for a testimony. In the Greek it is εἰς μαρτύριον, that is, for the glory of martyrdom.”