Shared ground
Revelation 19:1–4 presents heaven’s reaction to Babylon’s fall, and it is unambiguously celebratory. John hears a huge crowd in heaven calling out repeated hallelujah, and they direct their praise to God as the one to whom “salvation, glory, and power” belong.
The passage also gives reasons for the praise. It explicitly claims God’s judgments in this case are “true and righteous,” that God has judged “the great prostitute” for corrupting the earth, and that God has answered the violence done to his servants (“avenged the blood”).
Finally, the scene stresses finality. The image of smoke rising “forever and ever” communicates that Babylon’s downfall is not temporary or reversible. The elders and living creatures respond by bowing before the enthroned God and confirming the praise with “Amen” and “Hallelujah.”
Where interpretation differs
Who “Babylon / the great prostitute” is: Some read Babylon mainly as a symbolic way to speak about Rome in John’s day (an oppressive, wealthy imperial center). Others treat Babylon as a broader symbol for any powerful system or city that enriches itself through corruption and persecution, including (for some) a future end-time expression of that kind of power.
How to read “her smoke goes up forever and ever”: Some take it as vivid apocalyptic imagery for irreversible collapse and lasting public evidence of ruin. Others think it leans toward an ongoing, unending ruin (not necessarily a literal fire, but a continuing state of destruction).
What “avenged the blood” implies: Many read this as God’s public vindication of persecuted servants through judgment on the persecuting power. Others emphasize the timing question—whether this points to a near-term historical judgment in John’s world, a final end-time judgment, or a pattern that includes both.
Why the disagreement exists
Revelation communicates through symbols that can point both to first-century realities and to larger recurring patterns. Also, phrases like “forever and ever” can function either as a strict duration claim or as intensified language to underline permanence and completeness.
What this passage clearly contributes
This text explicitly links heaven’s worship to God’s character shown in judgment: his decisions are called reliable and fair, not arbitrary. It frames Babylon’s fall as moral judgment on corruption and on violence against God’s servants, and it portrays that fall as decisive. It also shows worship as communal and responsive: a multitude proclaims, then repeats, and the throne-room leaders confirm with “Amen” and “Hallelujah” (Revelation 19:1–19:4).