Exodus 7:8-13

8The Lord said to Moses and Aaron,

9“When Pharaoh says to you, ‘Give me a sign to prove that God has sent you,’ tell Aaron, ‘Take your shepherd’s staff and throw it down in front of Pharaoh,’ and it will become a large snake.”

10Moses and Aaron went to Pharaoh and did as the Lord had commanded. Aaron threw his staff down in front of Pharaoh and his officials, and it became a large snake.

11Then Pharaoh sent for his wise men and sorcerers. These Egyptian magicians did the same thing using their magic spells.

12Each of them threw his staff down, and they all became large snakes. But Aaron’s staff swallowed theirs.

13Yet, Pharaoh continued to be stubborn and would not listen to them, as the Lord had predicted.