Jesus teaching in both Mark and Luke would have been taken as shocking, countercultural, and absolute. These authors would have needed to provide their reading indication that divorce would be acceptable in certain instances. After the absolute statements, the readers could not be expected to assume it.Remarriage in Early Christianity, 104, Eerdmans
For its original audience, Luke 16:18 would have made clear that there was to be no remarriage for either partner of a divorce, without exception.Remarriage in the Early Church, 102
In a world of widespread divorce and remarriage, Paul's Jesus taught that the marital bond had long-term implications. If divorced, remarriage was not an option.Remarriage in Early Christianity, 67, Eerdmans
If an unbelieving husband divorces his wife, she is no longer bound to her husband, but she is still bound to the law of God. The freedom of a deserted believer does not imply the freedom to marry.Divorce Myth, 87