And cried when they saw the smoke of her burning, saying, What city is like unto this great city!

People's New Testament

18:15-19 The merchants of these things... shall stand afar off. The lamentation of the kings over the fall of the city has been given in Re 18:9-14. The lamentation of the merchants is now given. They are also represented as standing afar off. With them join the shipmasters and mariners who have been engaged in her trade. These all mourn because their profits from her are brought to an end.

Jamieson-Fausset-Brown Bible Commentary

18. when they saw-Greek, "horontes." But A, B, C, and Andreas read, Greek, "blepontes," "looking at." Greek, "blepo," is to use the eyes, to look: the act of seeing without thought of the object seen. Greek, "horao," refers to the thing seen or presented to the eyes [Tittmann].

smoke-so B, C. But A reads "place."

What city is like-Compare the similar beast as to the beast, Re 13:4: so closely do the harlot and beast approximate one another. Contrast the attribution of this praise to God, to whom alone it is due, by His servants (Ex 15:11). Martial says of Rome, "Nothing is equal to her;" and Athenæus, "She is the epitome of the world."

Matthew Henry's Concise Commentary

18:9-19 The mourners had shared Babylon's sensual pleasures, and gained by her wealth and trade. The kings of the earth, whom she flattered into idolatry, allowing them to be tyrannical over their subjects, while obedient to her; and the merchants, those who trafficked for her indulgences, pardons, and honours; these mourn. Babylon's friends partook her sinful pleasures and profits, but are not willing to share her plagues. The spirit of antichrist is a worldly spirit, and that sorrow is a mere worldly sorrow; they do not lament for the anger of God, but for the loss of outward comforts. The magnificence and riches of the ungodly will avail them nothing, but will render the vengeance harder to be borne. The spiritual merchandise is here alluded to, when not only slaves, but the souls of men, are mentioned as articles of commerce, to the destroying the souls of millions. Nor has this been peculiar to the Roman antichrist, and only her guilt. But let prosperous traders learn, with all their gains, to get the unsearchable riches of Christ; otherwise; even in this life, they may have to mourn that riches make to themselves wings and fly away, and that all the fruits their souls lusted after, are departed from them. Death, at any rate, will soon end their commerce, and all the riches of the ungodly will be exchanged, not only for the coffin and the worm, but for the fire that cannot be quenched.