Revelation 16:4-7

And the third poured out his bowl on the rivers and the springs of water, and they became blood. And I heard the angel of the waters saying, “You are righteous, the one who is and the one who was, the Holy One, because you have judged these things, because they have poured out the blood of the saints and prophets, and you have given them blood to drink; they are deserving!” And I heard the altar saying, “Yes, Lord God All-Powerful, true and righteous are your judgments.”