Exodus 7:8-10

American Standard Version

⁸ And Jehovah spake unto Moses and unto Aaron, saying, ⁹ When Pharaoh shall speak unto you, saying, Show a wonder for you; then thou shalt say unto Aaron, Take thy rod, and cast it down before Pharaoh, that it become a ^[a]serpent. ¹⁰ And Moses and Aaron went in unto Pharaoh, and they did so, as Jehovah had commanded: and Aaron cast down his rod before Pharaoh and before his servants, and it became a serpent.