The inscription quotes the beginning of chapter 15:
'I saw in heaven another great and marvellous sign: seven angels with the seven last plagues—last, because with them God’s wrath is completed (Revelation 15, 1).
These angels are pouring the rest of the wrath of God from their basins everywhere, according to the narrative:
Then one of the four living creatures gave to the seven angels seven golden bowls filled with the wrath of God, who lives forever and ever. And the temple was filled with smoke from the glory of God and from his power, and no one could enter the temple until the seven plagues of the seven angels were completed (Revelation 15, 7-8)
and to the entire chapter 16, where every angel pours out the wrath on a different part of the world:
... The sixth angel poured out his bowl on the great river Euphrates, and its water was dried up to prepare the way for the kings from the East. Then I saw three impure spirits that looked like frogs; they came out of the mouth of the dragon, out of the mouth of the beast and out of the mouth of the false prophet (Rev. 16, 12-13). This is illustrated in the lower part.
