Elder brother of Moses and Miriam, appointed by God as Moses' spokesman before Pharaoh since Moses felt unable to speak well. He became the first High Priest of Israel, establishing the Aaronic priesthood. He made the golden calf when the people grew impatient, but later led priestly worship according to God's instructions. He died on Mount Hor.
And the anger of the LORD was kindled against Moses, and he said, Is not Aaron the Levite thy brother? I know that he can speak well. And also, behold, he cometh forth to meet thee: and when he seeth thee, he will be glad in his heart.Exodus 4:14, KJV
Exodus 7:1
And the LORD said unto Moses, See, I have made thee a god to Pharaoh: and Aaron thy brother shall be thy prophet.Exodus 7:1, KJV
Exodus 28:1
And take thou unto thee Aaron thy brother, and his sons with him, from among the children of Israel, that he may minister unto me in the priest’s office, even Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron’s sons.Exodus 28:1, KJV
Leviticus 8:2
Take Aaron and his sons with him, and the garments, and the anointing oil, and a bullock for the sin offering, and two rams, and a basket of unleavened bread;Leviticus 8:2, KJV
Hebrews 5:4
And no man taketh this honour unto himself, but he that is called of God, as was Aaron.Hebrews 5:4, KJV
See how Aaron connects to every other figure in Scripture.