Revelation 16:4-7 - The Third Bowl
4 And the third poured out his vial into the rivers and fountains of waters; and they became blood. 5 And I heard the angel of the waters saying, Righteous art thou, who art and wast holy, because thou hast judged thus; 6 for they shed the blood of saints and prophets, and thou hast given them blood to drink; they deserve it.
7 And I heard the altar saying, Even so, Lord God Almighty! true and righteous are thy judgments.