John the Apostle
Revelation 19:3ESV·traditional attribution

Once more they cried out, “Hallelujah! The smoke from her goes up forever and ever.”

Matthew Henry Presbyterian @wholebiblehenry

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.

Commenting on Revelation 19:1-4

John Gill Reformed Baptist @doctorgill

And again they said, Alleluia,.... Or a "second time" they said it; they began and ended their solemn worship and service with it; so some psalms begin and end with this word, translated in the Old Testament by the words "Praise ye the LORD", as in Psa 106:1 &c.

Albert Barnes Presbyterian @notesbybarnes

Verse 3. And again they said, Alleluia. . The event was so glorious and so important; the final destruction of the great enemy of the church was of so much moment in its bearing on the welfare of the world, as to call forth repeated expressions of praise. And her smoke rose up for ever and ever. .