Revelation 16:4-7 - The Third Bowl
4 Then the third angel emptied his bowl upon the rivers and springs of water; and it turned to blood. 5 And I heard the Angel of the Waters saying-- 'Righteous art thou, thou who art and who wast, the Holy One, in inflicting this judgment; 6 for men shed the blood of Christ's People and of the Prophets, and thou hast given them blood to drink. It is what they deserve.'
7 And I heard the response from the altar-- 'Yes, O Lord, our God, the Almighty, true and righteous are they judgments.'