Theophylact of Ohrid

But you, He says, take heed, for they will deliver you up to councils. He introduces the discourse about them at the right moment — that they will be delivered up to councils — so that from the common calamities they might receive some consolation in their own personal afflictions. But when the Lord said, "before governors and kings you shall be brought for My sake," by these words too He gave no small consolation to the disciples, namely that they would suffer for His sake. …

Commentary on Mark ↗

Gregory the Dialogist

But because all these things come not from the injustice of the one striking but from the merit of the world that suffers, the deeds of wicked men are set forth first when it is said: "But before all these things they will lay their hands upon you and persecute you, and deliver you to synagogues, leading you before kings and governors for my name's sake. But these things will happen to you for a testimony." For a testimony, clearly, of whom, unless of those who either inflict death by persecuting or who see and do not imitate? …

Forty Gospel Homilies, Homily 35 ↗

Bede

But watch yourselves, for they will deliver you up to councils, and you will be beaten in synagogues, and you will stand before kings and governors for my sake, for a testimony to them. Indeed, the very fact that the Jewish people, either alone or as the greatest cause, were the cause of their own destruction, because after the killing of the Lord Savior, they tormented the heralds and confessors of his name and faith with impious cruelty.

On the Gospel of Mark ↗