Exodus 7:8-13

The LORD said to Moses and Aaron, ‘When Pharaoh says to you, “Perform a miracle,” then say to Aaron, “Take your staff and throw it down before Pharaoh,” and it will become a snake.’ So 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. Pharaoh then summoned the wise men and sorcerers, and the Egyptian magicians also did the same things by their secret arts: each one threw down his staff and it became a snake. But Aaron’s staff swallowed up their staffs. Yet Pharaoh’s heart became hard and he would not listen to them, just as the LORD had said.