Where did Paul receive the revelations of the doctrines of grace, and who did he take them to?
Paul received the revelations of the doctrines of grace at Mount Sinai in Arabia, the same mountain where Moses received the Law. He did not take them to Israel; he took them to the Gentile world. After three years, he went up to Jerusalem to see Peter.
Les explains that just as God gave the Law to Moses on Mount Sinai, and Moses brought it down to Israel, so Paul went to that same mountain in Arabia and received all the revelations of the doctrines of grace. Rather than taking them to Israel, Paul took them to the Gentile world. Les notes that Paul did not immediately go to Jerusalem to check in with Peter; he conferred not with flesh and blood. After three years, Paul went up to Jerusalem to see Peter. Les also points out the Corinthians' controversy: they claimed Paul did not have the three years with Jesus that Peter had, but Les suggests Paul had it even better, with three years alone with the Lord at Mount Sinai.
For this Agar is mount Sinai in Arabia, and answereth to Jerusalem which now is, and is in bondage with her children.
More Questions
Why did God reveal the doctrines of grace to Saul at Mount Sinai in Arabia?
Because Hagar is identified with Mount Sinai in Arabia, the same place where God gave the Law to Moses, God fittingly took Saul there to reveal the doctrines of grace.