Exodus 7:8-10

Young's Literal Translation

⁸ And Jehovah speaketh unto Moses and unto Aaron, saying,

⁹ `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.'

¹⁰ 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.