“G-d said to Moshe, ‘See, I have made you a master over Pharoah, and Aaron your brother shall be your spokesman. You shall speak everything I shall command you, and Aaron your brother shall speak to Pharoah, that he should send the Children of Israel from his land.’” Shemot/Exodus 7:1-2

Aaron, the older brother of Moshe, was assigned by G-d to speak on Moshe’s behalf and assist in initiating many of the miracles that freed the Jewish people from Egyptian bondage and saw them through the 40 years in the wilderness. He became the first Kohen Gadol (high priest) and his descendants were made the priest class to this day.