Psalm 78:44

And had turned their rivers into blood; and their floods, that they could not drink.

Cross-references

Psalm 105:29 describes the same plague of blood turning waters to blood, a direct parallel to this verse.

Exodus 7:17-21 is the original account of the Nile turned to blood, which this verse poetically summarizes.

Revelation 16:3-6 repeats the plague of blood as end-time judgment, mirroring the Exodus pattern from Psalm 78:44.

Exodus 7:20 records the original plague of blood that Psalm 78:44 summarizes.