The commentors here and elsewhere who dwell on Matthew 19 do not seem to even be aware of John's Gospel story of the woman caught in adultery.  Yes, of course there are standing problems with the authenticity of the text -- which is hardly a surprise in any event.  However, that story is soooo like the Jesus who heals, and loves the sinner, and offered his life as a ransom!  "Neither do I condemn thee; now go thy way and sin no more."  (Once I heard a judge sitting in his courtroom dispatch a case using those very words!  And I'm proud to say of him that he was once a student of mine.)  How interesting that these commentors do not want to elevate this teaching from John to the level of law, as they do with Matthew 19!