Bede the Venerable — as excerpted in the Catena Aurea on Luke 11:45-54

“It is asked, How comes it that the blood of all the prophets and just men is required of the single generation of the Jews; whereas many of the saints, both before the Incarnation and after, have been slain by other nations? But it is the manner of the Scriptures frequently to reckon two generations of men, one of the good, and the other of the evil.”