Theophylact of Ohrid — as excerpted in the Catena Aurea on Mark 13:9-13

“Fitly also did He premise a recital of those things which concerned the Apostles, that in their own tribulations they might find some consolation in the community of troubles and sufferings. There follows: And ye shall be brought before rulers and kings for my sake, for a testimony against them. He says kings and rulers, as, for instance, Agrippa, Nero, and Herod. Again, His saying, for my sake, gave them no small consolation, in that they were about to suffer for His sake. For a testimony against them, means, as a judgment beforehand against them, that they might be inexcusable, in that though the Apostles were labouring for the truth, they would not join themselves to it. Then, that they might not think that their preaching should be impeded by troubles and dangers, He adds: And the Gospel must first be published among all nations.”