Exodus 7:7-9

King James Version

⁷ And Moses was fourscore years old, and Aaron fourscore and three years old, when they spake unto Pharaoh.

⁸ And the Lord spake unto Moses and unto Aaron, saying,

⁹ When Pharaoh shall speak unto you, saying, Shew a miracle for you: then thou shalt say unto Aaron, Take thy rod, and cast it before Pharaoh, and it shall become a serpent.