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.
And the fish that was in the river died; and the river stank, and the Egyptians could not drink of the water of the river; and there was blood throughout all the land of Egypt.
And the magicians of Egypt did so with their enchantments. Exodus 7:20-22
Aaron stretched out his hand over the waters of Egypt; and the frogs came up, and covered the land of Egypt.
And the magicians did so with their enchantments, and brought up frogs upon the land of Egypt. Exodus 8:6-7