Exodus 7:23

²¹And the fish in the river died, and the river stank thereupon; and the Egyptians could not drink water from the river, and the blood was in all the land of Egypt.

²²And the charmers also of the Egyptians did so with their sorceries; and the heart of Pharaoh was hardened, and he did not hearken to them, even as the Lord said.

— Exodus 7:23 —

²⁴And all the Egyptians dug round about the river, so as to drink water, for they could not drink water from the river.

²⁵And seven days were fulfilled after the Lord had smitten the river.