Revelation 16:4-7 - The Third Bowl
4 The third angel poured his bowl into the rivers and springs of water, and they became blood. 5 And I heard the angel of the waters say, "Righteous art Thou, who art and wast, the holy One, because Thou hast thus taken vengeance. 6 For they poured out the blood of Thy people and of the Prophets, and in return Thou hast given them blood to drink. And this they deserved."
7 And I heard a voice from the altar say, "Even so, O Lord God, the Ruler of all, true and righteous are Thy judgments."