Exodus 7:5-7

Amplified Bible

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