A.T. Robertson Commentary Revelation 19:3

"And a second time they say, Hallelujah. And her smoke goeth up for ever and ever." — Revelation 19:3 (ASV)

A second time (δευτερον). Adverbial accusative, a heavenly encore.

They say (ειρηκαν). Perfect active indicative of ειπον. "They have said," not an "aoristic" perfect for "they say," but vivid dramatic perfect as in 5:7 and the form in -αν instead of - ασιν as in 18:3; 21:6.

Goeth up (αναβαινε). Linear present active indicative of αναβαινω, "keeps on going up," "a last touch to the description already given (18:21ff.) of Babylon's utter collapse" (Swete). The smoke of the city's ruin (14:11; 18:8f.,18) instead of incense (8:4). Cf. Isaiah 34:9f.