Exodus 7:5-7

American Standard Version

⁵ And the Egyptians shall know that I am Jehovah, when I stretch forth my hand upon Egypt, and bring out the children of Israel from among them. ⁶ And Moses and Aaron did so; as Jehovah commanded them, so did they. ⁷ And Moses was fourscore years old, and Aaron fourscore and three years old, when they spake unto Pharaoh.