Revelation 16:4-6

Mace(i) 4 The THIRD angel poured out his vial upon the rivers and fountains; and they became blood. 5 and I heard the angel of the waters say, "thou art just, who art, and hast always been holy, because thou hast judged thus: 6 for they have shed the blood of saints and prophets: thou hast given them blood to drink; for they have deserv'd it."