JESUS THE MESSIAH--1
Several times in the gospels Jesus of Nazareth is called, Son of David.  The Jews knew that was the preliminary form of the title, messiah, because the sign of the messiah is that he would take the throne of David.  Some Jews accepted Jesus as the messiah, many did not.
  A blind man in Luke 18.39 is told Jesus of Nazareth is passing by.  The blind man immediately calls Him, Son of David.  How did he know Jesus was the Son of David?

  Joseph, the husband of Mary, descended from David through Solomon, Matt. 1.6.  In fact, an angel calls Joseph--son of David, in Matt. 1.20.  Six more times in the gospel of Matthew Jesus is called or known as the Son of David, the one who will take the throne of David.--
    Matt. 9.27, 12.23, 15.22, 21.9, 21.15, 22.42.
But calling Jesus the son of David was not true biologically since Joseph was not His true father.  So why was Jesus called the Son of David?

  The identity of the messiah was a well-known theme but not a specific one.  In Psalm 2.6 the psalmist of this song says--
    I have installed My King upon Zion, My holy mountain.
In 2.12 he says--
    Do homage to the Son, lest He become angry
    and you perish in the way,
    for His wrath may soon be kindled.
    How blessed are all those who take refuge in Him.
  Here we see the psalmist, who is not named, say the messiah is the Son, His wrath will be kindled, and those who take refuge in Him are blessed.

  The messiah is the one who fulfills the covenant with God by which the works of the devil are ended, ushering in a reign of peace and prosperity for Israel under God.  This path of the messiah from Genesis 3 through the OT is shown by Noah, Abraham, Joseph, Moses and the prophets.

  So the messiah--
  must be born a man to be the seed of Eve, Gen. 3.
  will be a preacher of righteousness like Noah, Gen. 6.7.
  will be a man of faith like Abraham, through whom all the nations of the world will be blessed, Gen. 12.
  will come through Judah as Jacob announced, Gen. 49.
  will suffer in order to be exalted like Joseph, Gen. 37-48.
  will be a prophet and savior like Moses, Exodus 2-16.

  This is the wider application of the messiah through the OT to Israel.  But there is in the OT a closer portrait of the messiah--
  the psalms say he will be Son and King, Psalm 2.
  Isaiah says he will be born of a virgin, 7.14, son of David, 9.1, the branch who will bring redemption and blessing, ch. 11, and the bringer of joy, 61.1.
  Micah said the messiah will shepherd his people, Micah 5.1.
  Amos said the messiah will be for all peoples, Amos 9.11.
  Jeremiah said the messiah will be the king of righteousness, Jer. 23.5.

  Now the NT writers know of these prophecies and fulfillments.  Matthew says Jesus was born of Abrahamic and Davidic lineage, Matt. 1.2-16.  Luke says the same thing in Luke 2.4-15.  John the Baptist refers to the saving role of Jesus in John 1.29 when he calls Him, the Lamb of God.  Matthew says Jesus will bring judgment as well as life, Matt. 3.1-12.  Luke 1.51-55 says the same thing, that Jesus will bring down the rulers and bless Israel.  Luke and John say Jesus was anointed as messiah at His baptism, Luke 4.16-22, John 4.24-25.

  Then, what does all this mean?

  For us it means the role of messiah was a royal one, taking the throne of David and more than that.  The messiah takes a priestly role in Hebrews 10.19-22--
    Since therefore brethren we have confident to enter the holy place by the blood of Jesus, by a new and living way which He inaugurated for us through the veil, that is, His flesh and since we have a great high priest over the house of God, let us draw near...

  He takes a kingly role so that the Magi say when Jesus is born in Matt. 2.2--
    where is He who is born King of the Jews...
and Pilate wrote when Jesus died on the cross--
    Jesus the Nazarene, the King of the Jews, John 19.19.

  And He takes the role of a prophet, as the crowd said in Matt. 21.11--
    This is the prophet Jesus, from Nazareth of Galilee..

  All of this is to inaugurate the kingdom of God.  That kingdom came then and through the church as the body of Christ the same kingdom is here now.  Praise the Lord.