It is noteworthy that Jesus clearly sees some circumstances that legitimize divorce. A marriage continues to be valid until one party dissolves the marriage through unfaithfulness. This so-called exception clause appears here in Matthew 5 and again in Matthew 19 but does not occur in either Mark or Luke.
Although remembered now for his elegantly argued critical essays, Matthew Arnold (1822-1888) began his career as a poet, winning early recognition as …
Matthew S. | Tutor in Essay Writing | The Princeton Review
It has therefore beenconjectured that there was once a document (usually called Q), now lost,that is basically a collection of speeches by Jesus, and that Matthew(the evangelist) and Luke had access to it while Mark did not.