Exodus 7:10-12

10So Moses and Aaron went to Pharaoh and did just as the LORD commanded. Aaron threw his staff down in front of Pharaoh and his officials, and it became a snake. 11Pharaoh then summoned wise men and sorcerers, and the Egyptian magicians also did the same things by their secret arts: 12Each one threw down his staff and it became a snake. But Aaron’s staff swallowed up their staffs.