Revelation 18:21
Then a mighty angel picked up a stone the size of a great millstone and cast it into the sea, saying:
What it says
A mighty angel throws a millstone into the sea as a sign that Babylon will be cast down violently and never found again.
What it is doing
This verse symbolizes the irreversible finality of Babylon's destruction.
In context
21Then a mighty angel picked up a stone the size of a great millstone and cast it into the sea, saying: 22And the sound of harpists and musicians, 23The light of a lamp 24And there was found in her the blood of prophets and saints, and of all who had been slain on the earth.