Exodus 7:5-7

World English Bible

⁵ The Egyptians shall know that I am Yahweh 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 Yahweh commanded them, so they did. ⁷ Moses was eighty years old, and Aaron eighty-three years old, when they spoke to Pharaoh.