Revelation 16:4-7 - The Third Bowl
4 And the third angel shed out his vial upon the rivers and fountains of waters, and they turned to blood. 5 And I heard an angel say, "Lord which art and wast, thou art righteous and holy, because thou hast given such judgments, 6 for they shed out the blood of saints, and prophets, and therefore hast thou given them blood to drink: for they are worthy."
7 And I heard another out of the altar say, "Even so, Lord God almighty, true and righteous are thy judgments."