And there was found in her the blood of prophets and saints, and of all who had been slain on the earth.
Here we have, I. A doleful lamentation made by Babylon's friends for her fall; and here observe, 1. Who are the mourners, namely, those who had been bewitched by her fornication, those who had been sharers in her sensual pleasures, and those who had been gainers by her wealth and trade - the kings and the merchants of the earth: the kings of the earth...
Commenting on Revelation 18:9-24
Verse 24. And in her. When she came to be destroyed, and her real character was seen. Was found the blood of prophets. Of the public teachers of the true religion. On the word prophets, . And of saints. Of the holy. . And of all that were slain upon the earth.
Applied by Christ (Mat 23:35) to apostate Jerusalem, which proves that not merely the literal city Rome, and the Church of Rome (though the chief representative of the apostasy), but the WHOLE of the faithless Church of both the Old and New Testament is meant by Babylon the harlot; just as the whole Church (Old and New Testament) is meant by "the woman" (Rev 12:1).