Exodus 4:9

9. The third sign symbolizes Jehovah’s power over Egypt and her gods . But for the Nile there would be no Egypt; and when Moses smote the water of the river he turned the very breast milk of Egypt to blood. And, besides, the Nile was a national god, for its fertilizing power was deemed to proceed from Osiris himself . Thus Jehovah smites Egypt’s life-giving god, who is stretched through the land a loathsome corpse .