<P> The threefold office (Latin: munus triplex) of Jesus Christ is a Christian doctrine based upon the teachings of the Old Testament of which Christians hold different views . It was described by Eusebius and more fully developed by John Calvin . </P> <P> The doctrine states that Jesus Christ performed three functions (or "offices") in his earthly ministry - those of prophet (Deuteronomy 18: 14 - 22), priest (Psalm 110: 1 - 4), and king (Psalm 2) </P> <P> In the Old Testament, the appointment of someone to any of these three positions could be sanctioned by anointing him by pouring oil over his head . Thus the term messiah, meaning "anointed one", is associated with the concept of the threefold office . While the office of king is that most frequently with the Messiah, the role of Jesus as priest, which involves intercession before God, is also prominent in the New Testament, being most fully explained in chapters 7 to 10 of the Book of Hebrews . </P>

The book that describes how christ fulfills the function of a priest is