Revelation 16:4-7 - The Third Bowl
4 The third angel poured out his bowl into the rivers and the springs of water, and they became blood. 5 And I heard the angel in charge of the waters say, "Just are you, O Holy One, who is and who was, for you brought these judgments. 6 For they have shed the blood of saints and prophets, and you have given them blood to drink. It is what they deserve!"
7 And I heard the altar saying, "Yes, Lord God the Almighty, true and just are your judgments!"