Exodus 7:6 in the King James Version
And Moses and Aaron did as the LORD commanded them, so did they.
Context
5 The Egyptians shall know that I am the LORD when I stretch out my hand on Egypt, and bring the children of Israel out from among them.”
6 Moses and Aaron did so. As the LORD commanded them, so they did.
7 Moses was eighty years old, and Aaron eighty-three years old, when they spoke to Pharaoh.