Exodus 7:5-7

New Revised Standard Version, Anglicised

⁵ The Egyptians shall know that I am the Lord, when I stretch out my hand against Egypt and bring the Israelites out from among them.’ ⁶ Moses and Aaron did so; they did just as the Lord commanded them. ⁷ Moses was eighty years old and Aaron eighty-three when they spoke to Pharaoh.