Theophylact of Ohrid

Finally, yielding to their demand, he had the Lord scourged, that is, struck with a leather whip, so that it would appear that they had received Him as one already condemned at the tribunal, and "handed Him over to be crucified." For he wished to do what was pleasing and agreeable to the people, and not what was pleasing to God.

Commentary on Mark ↗

Cyprian

He himself suffered the lash, in whose name his servants now scourge the devil and his angels. He who now crowns the martyrs with eternal garlands was himself crowned with thorns.

Treatise IX. On the Advantage of Patience 7 ↗

Augustine of Hippo

The robber escaped, Christ was condemned. He who was loaded with criminal accusations received pardon; He who has released from their crimes all who confess Him, was condemned. Nevertheless even the cross itself, if thou considerest it well, was a judgment-seat; for the Judge being set up in the middle, one thief who believed was delivered, the other who reviled was condemned.

Tractates On John 31.11 ↗

Bede

But Pilate, willing to satisfy the people, released Barabbas to them and delivered Jesus, after having him scourged, to be crucified. Jesus, however, is understood to have been scourged not by another, but by Pilate himself. For John writes openly: They all cried again, saying: Not this man, but Barabbas. Now Barabbas was a robber. Then Pilate took Jesus and scourged him (John XVIII). And then he adds: And the soldiers, weaving a crown of thorns, placed it on his head, etc. (John XIX). …

On the Gospel of Mark ↗