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.
Primacy of Peter
Moreover, Peter is always named first in all listings of the Apostles; Judas is invariably mentioned last. In Peter is described as the "first Apostle". It is important to note that Peter was neither the first Apostle in age nor election; therefore, Peter must be the first Apostle in the sense of authority, if you ignore the possibility of him being first in the sense of first in the list of Twelve Apostles. According to , St. Peter was the leader of the early Christian church in Jerusalem. Jesus also instructed St. Peter to strengthen his brethren, i.e., the apostles, according to .