Psalm 78:44 in the King James Version
And had turned their rivers into blood; and their floods, that they could not drink.
Context
43 how he set his signs in Egypt, his wonders in the field of Zoan,
44 he turned their rivers into blood, and their streams, so that they could not drink.
45 He sent among them swarms of flies, which devoured them; and frogs, which destroyed them.