Complete Commentary on the Whole Bible, by Matthew Henry, at sacred-texts.com
(Rev 18:1-3) Another angel from heaven proclaims the fall of mystical Babylon.
(Rev 18:4-8) A voice from heaven admonishes the people of God, lest they partake of her plagues.
(Rev 18:9-19) The lamentations over her.
(Rev 18:20-24) The church called upon to rejoice in her utter ruin.
The downfall and destruction of the mystical Babylon are determined in the counsels of God. Another angel comes from heaven. This seems to be Christ himself, coming to destroy his enemies, and to shed abroad the light of his gospel through all nations. The wickedness of this Babylon was very great; she had forsaken the true God, and set up idols, and had drawn all sorts of men into spiritual adultery, and by her wealth and luxury kept them in her interest. The spiritual merchandise, by which multitudes have wickedly lived in wealth, by the sins and follies of mankind, seems principally intended. Fair warning is given to all that expect mercy from God, that they should not only come out of this Babylon, but assist in her destruction. God may have a people even in Babylon. But God's people shall be called out of Babylon, and called effectually, while those that partake with wicked men in their sins, must receive of their plagues.
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.
That which is matter of rejoicing to the servants of God on earth, is matter of rejoicing to the angels in heaven. The apostles, who are honoured and daily worshipped at Rome in an idolatrous manner, will rejoice in her fall. The fall of Babylon was an act of God's justice. And because it was a final ruin, this enemy should never molest them any more; of this they were assured by a sign. Let us take warning from the things which brought others to destruction, and let us set our affections on things above, when we consider the changeable nature of earthly things.