Revelation 16:4-7 - The Third Bowl
4 And the third angel poured out his vial on the rivers and fountains of waters, and they became blood. 5 And I heard the angel of the waters say, Righteous is the Lord, who is, and was, and who will be, because You have judged these things, 6 since they have poured out the blood of the saints and prophets; and You gave them blood to drink, for they were deserving.
7 And I heard another out of the altar saying, Even so, Lord God Almighty, true and righteous are Your judgments.