Chief Priests, Ordinary Priests, and Levites
The office of high priest carried with it a number of unique privileges and responsibilities. He alone was permitted to enter the holy of holies on the Day of Atonement to atone for the sins of the entire nation. As head of the Sanhedrin or Jewish supreme court, he presided over the nation's highest administrative and judicial body. His daily life was governed by the strictest rules of ceremonial purity. His death was viewed as an act of atonement and was marked by the release of a condemned murderer. Even if he retired from office he continued to wield great influence. Bible History Online.
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