Exodus 7:5-7

Revised Standard Version

⁵ And the Egyptians shall know that I am the Lord, when I stretch forth my hand upon Egypt and bring out the people of Israel from among them.” ⁶ And Moses and Aaron did so; they did as the Lord commanded them. ⁷ Now Moses was eighty years old, and Aaron eighty-three years old, when they spoke to Pharaoh.