..But those weren't His last words. His last words were spoken to Paul. And were revelations for the Church the Body of Christ. From Romans through Philemon. Giving us the beginning of the dispensation of the grace of God, the formation of the Church the Body of Christ, the role of the Body, when it began, what its duties are, and how it will end. Those things can only be found in Paul's epistles. Because the dispensation of grace was given to him from the risen Christ. Paul continually speaks of seeing and speaking to Christ face to face, and his being caught up to third heaven, and the revelations (PLURAL, NOT SINGULAR) that were given to him for the Church the Body of Christ.
We aren't preaching the Kingdom, Messianic gospel as Christ gave to Peter and the 11. We are preaching the Cross, the gospel of salvation by grace through faith, as given to Paul, the Apostle to the Gentiles. We are ambassadors for Christ, preaching reconciliation between God and man, based solely on the finished work of Christ.