According to the Book of Exodus, Aaron first functioned as Moses' assistant. Because Moses complained that he could not speak well, God appointed Aaron as Moses' “prophet” (Exodus 4:10-17; 7:1)
HIGH PRIEST AARON Dedication to God and Consecration
AARON: Courageous Proclaimer of God’s Word
Aaron is probably the eldest son of Amram (Ex 6:20), and according to the uniform genealogical lists (Ex 6:16-20; 1Ch 6:1-3), the fourth from Levi.