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.
Paul the Apostle and Judaism
The Book of Acts contains an account of Paul's travels and deeds, his conflicts with Greeks and Jews during the Julio-Claudian dynasty, and his interactions with the original apostles. The value of the historical information in "Acts", however, is challenged by some scholars. They believe that it was written from a perspective of reconciliation between Pauline Christianity and its opponents, so portrays Paul as a law-abiding Jew and omits his dispute with Peter, only briefly mentioning the split with Barnabas. Irenaeus in the 2nd century is the first of record to quote "Acts", and he used it against Marcion who rejected the Hebrew Bible. See also Luke–Acts.