Exodus 7:17-25
Thus said the LORD, In this you shall know that I am the LORD: behold, I will smite with the rod that is in my hand on the waters which are in the river, and they shall be turned to blood.
Nave's Topical Index—AKJV

Psalm 78:44
And had turned their rivers into blood; and their floods, that they could not drink.
Nave's Topical Index—AKJV

Psalm 105:29
He turned their waters into blood, and slew their fish.
Nave's Topical Index—AKJV