How long could Peter, James, and John keep ministering to the Jews?
Peter, James, and John could minister to the Jews only a few more years. The Romans would soon overrun Jerusalem, and Israel would cease to be a viable entity, scattered into every nation. After that, their ministry among the children of Israel would end.
Les explains that Peter, James, and John could go to the Jew only a few more years, because the Romans would overrun Jerusalem and Israel would cease to be a viable entity, scattered into every nation on earth. For the next few years they would indeed hold forth among the children of Israel, but it was practically a lost cause because of Israel's unbelief. That is exactly why Paul had to constantly defend his apostleship.