Exodus 7:5-8 English Standard Version (ESV)

5. The Egyptians shall know that I am the Lord, when I stretch out my hand against Egypt and bring out the people of Israel from among them.”

6. Moses and Aaron did so; they did just as the Lord commanded them.

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

8. Then the Lord said to Moses and Aaron,

Exodus 7