Revelation 16:4-7 - The Third Bowl
4 And the third angel poured out his bowl upon the rivers and fountains of waters; and they became blood. 5 And I heard the angel of the waters say, You are righteous, O Lord, who is, and was, and shall be, because you have judged thus. 6 For they have shed the blood of saints and prophets, and you have given them blood to drink; for they are deserving of it.
7 And I heard another out of the altar say, Even so, Lord God Almighty, true and righteous are your judgments.