Barnabas, born Joseph (Ἰωσήφ) or Joses (Ἰωσής), was according to tradition an early Christian, one of the prominent Christian disciples in Jerusalem. According to Acts 4:36, Barnabas was a Cypriot Jew. Named an apostle in Acts 14:14, he and Paul the Apostle undertook missionary journeys together and defended Gentile converts against the Judaizers. They traveled together making more converts, and participated in the Council of Jerusalem. Barnabas and Paul successfully evangelized among the "God-fearing" Gentiles who attended synagogues in various Hellenized cities of Anatolia.

Acts 4 is the fourth chapter of the Acts of the Apostles in the New Testament of the Christian Bible. The book containing this chapter is anonymous but early Christian tradition affirmed that Luke composed this book as well as the Gospel of Luke. This chapter records the Sanhedrin's arrest and subsequent release of the apostles in the aftermath of a healing by Simon Peter and his preaching in Solomon's Portico in the Temple in Jerusalem.