The prophecy of Jesus' birth much of the world recognizes is that of Isaiah 7:14: "Behold, the virgin shall conceive and bear a Son, and shall call His name Immanuel." This, of course, came to pass precisely: "After His mother Mary was betrothed to Joseph, before they came together, she was found with child of the Holy Spirit" (Matthew 1:18). Mary herself confirms she was a virgin: "How can this be, since I do not know a man?" (Luke 1:34).
His "immaculate conception" (not in the Roman Catholic sense) decreed His worthiness to be our High Priest and Mediator before the Father. Though not of Levi, Jesus qualifies as a priest "according to the order of Melchizedek" (Hebrews 7:14-15):
Therefore He is also able to save to the uttermost those who come to God through Him, since He ever lives to make intercession for them. For such a High Priest was fitting for us, who is holy, harmless, undefiled, separate from sinners, and has become higher than the heavens. (verses 25-26)
Richard T. Ritenbaugh
Born of a Woman