Revelation 16:4-7

And the third messenger did pour out his vial to the rivers, and to the fountains of the waters, and there came blood, and I heard the messenger of the waters, saying, ‘righteous, O Lord, art Thou, who art, and who wast, and who shalt be, because these things Thou didst judge, because blood of saints and prophets they did pour out, and blood to them Thou didst give to drink, for they are worthy;’ and I heard another out of the altar, saying, ‘Yes, Lord God, the Almighty, true and righteous [are] Thy judgments.’