The fall of Babylon being fixed, finished, and declared to be irrecoverable in the foregoing chapter, this begins with a holy triumph over her, in pursuance of the order given forth: Rejoice over her, thou heaven, and you holy apostles and prophets, Rev 18:20. They now gladly answer the call; and here you have, 1. The form of their thanksgiving, in that heavenly and most comprehensive word, Alleluia, praise you the Lord: with this they begin, with this they go on, and with this they end (Rev 19:4); their prayers are now turned into praises, their hosannas end in halleluias. 2. The matter of their thanksgiving: they praise him for the truth of his word, and the righteousness of his providential conduct, especially in this great event - the ruin of Babylon, which had been a mother, nurse, and nest of idolatry, lewdness, and cruelty (Rev 19:2), for which signal example of divine justice they ascribe salvation, and glory, and honour, and power, unto our God. 3. The effect of these their praises: when the angels and saints cried Alleluia, her fire burned more fiercely and her smoke ascended for ever and ever, Rev 19:3. The surest way to have our deliverances continued and completed is to give God the glory of what he has done for us. Praising God for what we have is praying in the most effectual manner for what is yet further to be done for us; the praises of the saints blow up the fire of God's wrath against the common enemy. 4. The blessed harmony between the angels and the saints in this triumphant song, Rev 19:4. The churches and their ministers take the melodious sound from the angels, and repeat it; falling down, and worshipping God, they cry, Amen, Alleluia.

I heard a great voice of much people in heaven - The idolatrous city being destroyed, and the blood of the martyred saints being avenged, there is a universal joy among the redeemed of the Lord, which they commence with the word הללו יה Hallelu-Yah, praise ye Jah or Jehovah; which the Septuagint, and St. John from them, put into Greek letters thus: Αλληλουΐα, Allelou-ia, a form of praise which the heathens appear to have borrowed from the Jews, as is evident from their paeans, or hymns in honor of Apollo, which began and ended with ελελευ ιη, eleleu ie; a mere corruption of the Hebrew words. It is worthy of remark that the Indians of North America have the same word in their religious worship, and use it in the same sense. "In their places of worship, or beloved square, they dance sometimes for a whole night always in a bowing posture, and frequently singing halleluyah Ye ho wah; praise ye Yah, Ye ho vah:" probably the true pronunciation of the Hebrew יהוה, which we call Jehovah. See Adair's History of the American Indians.
Salvation - He is the sole author of deliverance from sin; the glory of this belongs to him, the honor should be ascribed to him, and his power is that alone by which it is effected.

And after these things,.... After the angel had declared the fall of Babylon, a voice from heaven had called the people of God out of her, and had ordered them to take vengeance on her; after the mournful lamentation of the kings, merchants, and seafaring men; after another voice had called upon the saints to rejoice at her overthrow, and a mighty angel had described the manner of it, and had expressed her ruin in the strongest terms, with the reasons of it, John heard the songs of the righteous, as follow:

I heard a great voice of much people in heaven: not literally taken, for these are not the innumerable company of angels, who are never called people; nor the spirits of just men made perfect, or the souls of departed saints, but men on earth; wherefore heaven designs the church, as in Rev 18:20 and frequently in this book; the people are the same with the 144000 seen with the Lamb on Mount Zion, Rev 14:1 and with those on the sea of glass, who had got the victory over the beast, Rev 15:2 and are no other than God's covenant people, who are given to Christ, and made willing to be his in the day of his power; and though they are but a seed, a remnant, a small company, when compared with the world and carnal professors; yet are a large body of themselves, especially they will be at this time, when the nation of the Jews shall be born at once, and the fulness of the Gentiles will be brought in: and their voice on this occasion, the downfall of Rome, is said to be "great" partly on account of their number, who will join together in acclamations of praise, and partly on account of their great affection and vehemency of spirit, which will be raised hereby:

saying Alleluia; an Hebrew word, which signifies "praise ye the Lord". The Jews say (n), that the book of Psalms consists of ten sorts of songs, but Hallelujah is the greatest of them, because it comprehends the name (Jehovah) and praise in one word: and it is observable that this word, which is often used in the Psalms, is first used when the Psalmist desires the utter consumption and destruction of sinners and wicked men on earth, and is here taken up by the saints at the destruction of the man of sin and son of perdition; see Psa 104:35 and its being an Hebrew word shows that at this time the Jews will be converted, and that Jews and Gentiles will become one church state, and will worship and praise the Lord together; for the word is a call upon the saints to join together in solemn praise and thanksgiving; who is to be praised for the perfections of his nature, for the works of his hands, both of nature and grace; and for his righteous judgments on his and his church's enemies; and this is to be done in concert:

salvation, and glory, and honour, and power, unto the Lord our God: salvation, temporal, spiritual, and eternal, is of God; "salvation" from antichristian power and tyranny, and from all enemies, and the everlasting salvation of the soul; and the "glory" of it belongs to all the three Persons; they are glorious in themselves, and deserve all glory to be ascribed to them by man, and especially by the saints: "honour" is also their due; God the Father is to be honoured because he is the Father, and the Son is to he honoured as the Father is, and the Holy Spirit is not to be grieved, but to be highly esteemed and valued, and equally with the other two Persons: and "power" belongs to them all, and is seen in the works of creation, redemption, and sanctification.

(n) Yalkut Simeoni, par. 2. fol. 89. 1. T. Bab. Pesachim, fol. 117. 1.