Psalm 78:44 in the World English Bible
he turned their rivers into blood, and their streams, so that they could not drink.
Context
43 How he had wrought his signs in Egypt, and his wonders in the field of Zoan:
44 And had turned their rivers into blood; and their floods, that they could not drink.
45 He sent divers sorts of flies among them, which devoured them; and frogs, which destroyed them.