Exodus 7:7-9

Amplified Bible

⁷ Now Moses was eighty years old and Aaron eighty-three years old when they spoke to Pharaoh.

Aaron’s Rod Becomes a Serpent

⁸ Now the Lord said to Moses and Aaron, ⁹ “When Pharaoh says to you, ‘Work a miracle [to prove your authority],’ then you say to Aaron, ‘Take your staff and throw it down before Pharaoh, so that it may become a serpent.’”