Exodus 7:11-12, 22-25

Pharaoh called in his wise men and sorcerers. The magicians of Egypt did the same thing by their spells: each man threw down his staff and they all turned into snakes. But then Aaron’s staff swallowed their staffs.

But the magicians of Egypt did the same thing with their incantations. Still Pharaoh remained stubborn. He wouldn’t listen to them as GOD had said. He spun around and went home, never giving it a second thought. But all the Egyptians had to dig inland from the river for water because they couldn’t drink the Nile water. Seven days went by after GOD had struck the Nile.