Exodus 7:8-11

8Then the Lord said to Moses and Aaron,

9“Pharaoh will demand, ‘Show me a miracle.’ When he does this, say to Aaron, ‘Take your staff and throw it down in front of Pharaoh, and it will become a serpent.’”

10So Moses and Aaron went to Pharaoh and did what the Lord had commanded them. Aaron threw down his staff before Pharaoh and his officials, and it became a serpent!

11Then Pharaoh called in his own wise men and sorcerers, and these Egyptian magicians did the same thing with their magic.