Revelation 16:4-6

Darby Translation

⁴ And the third poured out his bowl on the rivers, and [on] the fountains of waters; and they became blood.

⁵ And I heard the angel of the waters saying, Thou art righteous, who art and wast, the holy one, that thou hast judged so;

⁶ for they have poured out the blood of saints and prophets, and thou hast given them blood to drink; they are worthy.