The Book of Hebrews was written by an unknown author.
The fourteenth of the Epistles, and the nineteenth book in the New Testament, is entitled Hebrews. It was written in approximately 68 AD, but by whom, we do not know. Several possible authors have been credited with the work, but the style of writing is unlike any other books in the Bible, and so the author remains unknown.
The letter is addressed to Jewish Christians, many of whom found themselves persecuted by their fellow Jews. The writer of Hebrews fears that Jewish Christians are in danger of slipping back into the Jewish faith because of this persecution. To affirm them in their new found Christian faith, the author shows them Christ's superiority over all Old Testament laws and practices. He urges the Christians to remain true to the Gospel of Jesus Christ, their saviour.
"whither the forerunner is for us entered, even Jesus, made an high priest for ever after the order of Melchisedec.
For this Melchisedec, king of Salem, priest of the most high God, who met Abraham returning from the slaughter of the kings, and blessed him; to whom also Abraham gave a tenth part of all; first being by interpretation King of righteousness, and after that also King of Salem, which is, King of peace."
Melchisedec received a tithe from Abraham, being above him. Therefore Melchisedec's (or Jesus') priesthood is superior to the Jewish priesthood, who are descended from Abraham