Psalms 78:44
“And had turned their rivers into blood; and their floods, that they could not drink.”
They remembered not his hand, nor the day when he delivered them from the enemy.
How he had wrought his signs in Egypt, and his wonders in the field of Zoan:
And had turned their rivers into blood; and their floods, that they could not drink.
He sent divers sorts of flies among them, which devoured them; and frogs, which destroyed them.
He gave also their increase unto the caterpiller, and their labour unto the locust.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“Thus saith the Lord, In this thou shalt know that I am the Lord: behold, I will smite with the rod that is in mine hand upon the waters which are in the river, and they shall be turned to blood.”
“And Moses and Aaron did so, as the Lord commanded; and he lifted up the rod, and smote the waters that were in the river, in the sight of Pharaoh, and in the sight of his servants; and all the waters that were in the river were turned to blood.”
“Thus saith the Lord, In this thou shalt know that I am the Lord: behold, I will smite with the rod that is in mine hand upon the waters which are in the river, and they shall be turned to blood.”
“He turned their waters into blood, and slew their fish.”
“And the second angel poured out his vial upon the sea; and it became as the blood of a dead man: and every living soul died in the sea.”