Exodus 7:10 – 12

New International Version (NIV)

¹⁰ 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. ¹¹ Pharaoh then summoned wise men and sorcerers, and the Egyptian magicians also did the same things by their secret arts: ¹² Each one threw down his staff and it became a snake. But Aaron's staff swallowed up their staffs.

From BibleGateway.com: http://www.biblegateway.com/passage/?search=search=Exodus+7.10-12&version=NIV
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