Revelation 16:4-6
Revelation 16:4-6 AMP
Then the third angel poured out his bowl into the rivers and the springs of water; and they turned into blood. [Ex 7:17-21] And I heard the angel of the waters saying, “Righteous and just are You, Who are and Who were, O Holy One, because You judged these things; for they have poured out the blood of the saints (God’s people) and the prophets, and You [in turn] have given them blood to drink. They deserve Your judgment.” [Ps 79:3]