The answer is: The rivers and fountains of waters became blood

Rev 16 vs 4

In the vivid and often enigmatic imagery of the Book of Revelation, the pourings of wrath encapsulate the high drama of divine judgment. After the third vial is cast upon the earth, it's fascinating to recall the connection to the ten plagues of Egypt, where water was turned into blood. This parallel evokes a history of turning about divine retribution, prompting reflection on the consequences of humanity's actions, particularly a lack of ethical integrity.

What's especially captivating in Revelation 16:4 is how the waters—essential sources of life and nourishment—transform into a substance associated with death and decay. The rivers and fountains no longer offer refreshment or sustenance; instead, they symbolize judgment against those who have cascaded waves of injustice and oppression. This powerful imagery tells a story not just of what is physically happening, but also unfolds about the fate of the righteous versus the wicked.

Did you know that wine and blood are frequent symbols throughout the Bible? They signify not only joy but also catastrophe, invoking themes of sacrifice and redemption. Furthermore, throughout Revelation, various references to water and the earth capture a cosmic clash with echoes of earlier prophetic writings, inviting deeper discussions about morality, accountability, and the still-relevant consequences of societal choices. Reflection on this third vial spotlights a continuous thread in both the Hebrew Scriptures and the New Testament, imploring readers to assess their action's wider implications in the tapestry of spiritual commitments.