Aaron was the brother of Moses who was of great support to Moses’ mission, he served as his spokesperson who helped relay the messages to Pharaoh. Aaron and his sons became the first priests to be appointed by God.
Now if perfection was through the Levitical priesthood (for on the basis of it the people received the Law), what further need was there for another priest to arise according to the order of Melchizedek, and not be designated according to the order of Aaron? HEBREWS 7:11 NASB
Ordinary leaders often become remarkable leaders because of extraordinary support. While Moses was arguably the greatest Hebrew leader during Bible times, much of his success came with the help of his brother, Aaron. Aaron stood alongside Moses as they confronted Pharaoh, and he compensated for Moses’ weakness by often serving as Moses’ spokesperson (see Exodus 4:10). And though Moses served as the principal leader of the Hebrew people, Aaron also held an important position of influence.
It was Aaron’s staff that became a snake before Pharaoh (Exodus 7:10). That same staff also turned Egypt’s water into blood (Exodus 7:19), brought frogs on the Egyptians (Exodus 8:5), and caused gnats to swarm the Egyptians (Exodus 8:16). Aaron and his sons became the first Hebrew priests appointed by God (Exodus 28:3). The significance of their role as intermediaries between God and the Hebrews became clearly evidenced when they interceded for the people after the rebellion of Korah, Dathan, and Abiram (Numbers 16).
While Aaron usually provided loyal assistance to Moses, he also experienced some notable failures as a supporter. For example, Aaron and his sister, Miriam, received a sound reprimand from God when they spoke against Moses for marrying a Cushite (Numbers 12:1–15). On another occasion, Aaron buckled under the pressure of the people and created a golden calf while Moses communed with God away from the camp (Exodus 32). As the people approached the Promised Land, Aaron died at the age of 123 on Mount Hor (Numbers 33:39).
Though generally a good priest, Aaron’s imperfection became an important theological symbol. In spite of faithful service to the people of God, Hebrew priests could not provide the perfect intercession required to obtain God’s complete forgiveness. Their service illustrated the need for something more, something better.
God met that need through the perfect priesthood initiated by Jesus Christ (see Hebrews 5:4; 7:11).