Revelation 16:4-6

Young's Literal Translation

⁴ And the third messenger did pour out his vial to the rivers, and to the fountains of the waters, and there came blood,

⁵ 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,

⁶ because blood of saints and prophets they did pour out, and blood to them Thou didst give to drink, for they are worthy;'