Revelation 16:8

Then another angel, the one who has authority over fire, came out from the altar; and he called with a loud voice to him who had the sharp sickle, saying, “Put in your sharp sickle and gather the clusters from the vine of the earth, because her grapes are ripe.”

Then I heard a loud voice from the sanctuary, saying to the seven angels, “Go and pour out on the earth the seven bowls of the wrath of God.”

I bear witness to everyone who hears the words of the prophecy of this book: If anyone adds to them, God will add to him the plagues which are written in this book.