Exodus 7:5-7

Young's Literal Translation

⁵ and the Egyptians have known that I [am] Jehovah, in My stretching out My hand against Egypt; and I have brought out the sons of Israel from their midst.'

⁶ And Moses doth -- Aaron also -- as Jehovah commanded them; so have they done;

⁷ and Moses [is] a son of eighty years, and Aaron [is] a son of eighty and three years, in their speaking unto Pharaoh.