Exodus 7:9-10

‘When Pharaoh speaketh unto you, saying, Give for yourselves a wonder; then thou hast said unto Aaron, Take thy rod, and cast before Pharaoh — it becometh a monster.’ And Moses goeth in — Aaron also — unto Pharaoh, and they do so as JEHOVAH hath commanded; and Aaron casteth his rod before Pharaoh, and before his servants, and it becometh a monster.