Exodus 7:11-15

Then Pharaoh also called for the wise men and the sorcerers, and they too, the soothsayer priests of Egypt, did the same with their secret arts.

For each one threw down his staff, and they turned into serpents. But Aaron’s staff swallowed their staffs.

Yet Pharaoh’s heart was hardened, and he did not listen to them, just as the Lord had said. Water Turned into Blood

Then the Lord said to Moses, “Pharaoh’s heart is stubborn; he refuses to let the people go.

Go to Pharaoh in the morning just as he is going out to the water, and position yourself to meet him on the bank of the Nile; and you shall take in your hand the staff that was turned into a serpent.