Who is the brother of Moses who was the first high priest of the Israelites in the Old Testament?

Aaron ranks as one of the three most important high priests mentioned in the Bible, the other two being Melchizedek and Jesus Christ.

As the older brother of Moses, Aaron played a major role in the Jews' escape from Egypt and their wanderings in the desert for 40 years.

Aaron acted as Moses' spokesman to Pharaoh in Egypt, because Moses complained to God that he could not do it himself, being slow of speech. Aaron also became an instrument of God in the miracles that convinced Pharaoh to let the Hebrew people go.

When God assigned Moses to free the enslaved Hebrews, Moses expressed self doubt (Exodus 4:13). Aaron stepped up as a strengthening partner throughout the ordeal, then later led the people in formalized worship of God in the wilderness.