Bede

And in her was found the blood of prophets and saints, etc. Did the same city kill the apostles, which also killed the prophets, or all the saints? But this is the city that Cain founded with the blood of his brother, and he named it after his son Enoch, that is, all his posterity. For the seven generations of Cain are described. In the building of this city, all the righteous blood is poured out from the blood of righteous Abel to the blood of Zechariah (Matt. 23), that is, of the people and the priest.

Commentary on Revelation ↗