Revelation 16:4-7

The third poured out his bowl into the rivers and the springs of water, and they became blood. I heard the angel of the waters say, You are just, the Holy One, who is and who was, because you have passed judgment on these things. Because they poured out the blood of the saints and the prophets, you have given them blood to drink; they deserve it! I heard the altar say, Yes, Lord God, the Almighty, true and just are your judgments.