Exodus 7:5-7

Complete Jewish Bible

⁵ Then, when I stretch out my hand over Egypt and bring the people of Isra’el out from among them, the Egyptians will know that I am Adonai.”

⁶ Moshe and Aharon did exactly what Adonai ordered them to do. ⁷ Moshe was eighty years old and Aharon eighty-three when they spoke to Pharaoh.