Acts 13

Paul is sent on his first missionary journey from the Church in Antioch, along with Barnabas.  And Acts 13 begins the final phase of the spread of the gospel "to the ends of the earth"  (Acts 1:8b).  Later in the chapter, Paul even quotes from Isaiah 49:6 "I have made you a light for the Gentiles, that you may bring salvation to the ends of the earth.", showing that this was all part of God's Plan.

At Pisidian Antioch, Paul was invited to speak, and he went through Biblical History from Genesis to 1&2 Samuel; and tied the Promises and prophecies of the Messiah to Christ, giving the essential gospel message (crucifixion, buriel, resurrection, and witness of resurrection) and Scriptural references.  He concluded in vs 38-39 with the key message that forgiveness of sins comes through Jesus Christ; and justification is by faith not through the Law.  There was overwhelming response to his message, and when he was invited to speak again the next week, almost the whole city gathered to hear.  This resulted in persecution from the envious Jews; but also spreading of the word and believers being "filled with joy and with the Holy Spirit."