Someone emailed:
Jesus never mentions remarriage. You say that Mark left out part of Jesus' teaching. Did Luke, who was known for his completeness also cut short the teaching of Jesus. And did Paul also leave out Jesus' teachings in Romans and in I Cor. ?
Reply: True, but Jesus never condemns polytheism or sex outside marriage. Every living Jew believed there was only one God, that sex was limited to marriage, and that remarriage was allowed after a valid divorce. Jesus taught that the 'Any Matter' divorces of the Hillelilites (which had become so popular it was virtually the only kind of divorce) was invalid, so if anyone remarried after an invalid divorce they were, in effect, committing adultery.
Luke left out lots of things which are in Mark. Paul left out almost everything in the Gospels. In the area of divorce, Paul doesn't mention anything about porneia. And everyone abbreviated what Jesus said. As John says, there wasn't enough papyrus in the world to record his words verbatim.See also "Is Remarriage Adultery?" in Divorce & Remarriage in the Church