It was for this reason. Because he both obeyed and preached Christ. But to this very day. God had helped him and showed his work to be genuine. What I say is the very same thing. The historical Christ was always the subject of Paul's preaching. The prophets and Moses had all predicted the things that did happen. They said that the Messiah would suffer and rise from death, to announce the light of salvation to both Jews and Gentiles. Compare Acts 15:15-18 and notes.

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Old Testament