Moses and Aaron went in to Pharaoh, and they did so, as the LORD had commanded: and Aaron cast down his rod before Pharaoh and before his servants, and it became a serpent.

For they cast down every man his rod, and they became serpents: but Aaron's rod swallowed up their rods.

"When Pharaoh speaks to you, saying, 'Perform a miracle.' then you shall tell Aaron, 'Take your rod, and cast it down before Pharaoh, that it become a serpent.'"