Exodus 7:5-7

Darby Translation

⁵ And the Egyptians shall know that I am Jehovah, when I stretch forth my hand on Egypt, and bring out the children of Israel from among them.

⁶ And Moses and Aaron did as Jehovah had commanded them: so did they.

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