Revelation 16:4

4AndΚαὶtheὁthirdτρίτοςpoured outἐξέχεενtheτὴνbowlφιάληνof himαὐτοῦintoεἰςtheτοὺςriversποταμοὺςandκαὶtheτὰςspringsπηγὰςof theτῶνwatersὑδάτων·andκαὶthey becameἐγένετοbloodαἷμα.

And the third poured out his bowl into the rivers and the springs of the waters, and they became blood.