Bede the Venerable — as excerpted in the Catena Aurea on Mark 14:26-31

“(ubi sup.) But the Lord foretells to His disciples what is about to happen to them, that when they have gone through it, they may not despair of salvation, but work out their repentance, and be freed; wherefore there follows: And Jesus saith unto them, All ye shall be offended because of me this night.”