Revelation 16:4-7

4The third angel poured out his bowl on the rivers and springs of water, and they became blood.

5Then I heard the angel in charge of the waters say: “You are just in these judgments, O Holy One, you who are and who were;

6for they have shed the blood of your holy people and your prophets, and you have given them blood to drink as they deserve.”

7And I heard the altar respond: “Yes, Lord God Almighty, true and just are your judgments.”