Exodus 7:5-7

King James Version

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

⁶ And Moses and Aaron did as the Lord commanded them, so did they.

⁷ And Moses was fourscore years old, and Aaron fourscore and three years old, when they spake unto Pharaoh.