The Epistle to the Hebrews drives home the point that Jesus was the greatest High Priest who performed an eternal sacrifice of everlasting covenant with God. Nowhere in the New Testament is the atonement of Jesus Christ more comprehensively taught than in the heart of this important text. Many features of this atonement, which fulfills and transcends the atoning sacrifices previously performed by the Levitical priests under the Law of Moses, are clearly presented here, particularly its compassion, power, sworn certainty, immortal operation, perfection, authority, mediation, sacrificial efficacy, covenantal sealing, and remitting generosity. To the witness of Hebrews, the briefer testimonies of Romans and 1 Peter are also added.
Craig R. Koester, Hebrews: A New Translation with Introduction and Commentary (New York: Doubleday, 2001), 352-62, 393-416.