Apostles
Later in the Gospel narratives the twelve apostles are described as having been commissioned to preach the Gospel to "all the nations", regardless of whether Jew or Gentile. Paul emphasized the important role of the apostles in the church of God when he said that the household of God is "built upon the foundation of apostles and prophets, Christ Jesus himself being the cornerstone".
Although not one of the apostles commissioned during the life of Jesus, Paul, a Jew named Saul of Tarsus, claimed a special commission from the risen Jesus and is considered "the apostle of the Gentiles", for his missions to spread the gospel message after his conversion. In his writings, the epistles to Christian churches throughout the Levant, Paul did not restrict the term "apostle" to the Twelve, and often refers to his mentor Barnabas as an apostle. The restricted usage appears in the Revelation to John.
Saint Matthias
There is no mention of a Matthias among the lists of disciples or followers of Jesus in the three synoptic gospels, but according to "Acts", he had been with Jesus from his baptism by John until his Ascension. In the days following, Peter proposed that the assembled disciples, who numbered about one hundred-twenty, nominate two men to replace Judas. They chose Joseph called Barsabas (whose surname was Justus) and Matthias. Then they prayed, "Thou, Lord, which knowest the hearts of all "[men]", shew whether of these two thou hast chosen, That he may take part of this ministry and apostleship, from which Judas by transgression fell, that he might go to his own place." Then they cast lots, and the lot fell to Matthias; so he was numbered with the eleven apostles.