Mark 10:12

If she herself shall put away her husband and marry another (ean auth apolusasa ton andra auth gamhsh). Condition of the third class (undetermined, but with prospect of determination). Greek and Roman law allowed the divorce of the husband by the wife though not provided for in Jewish law. But the thing was sometimes done as in the case of Herodias and her husband before she married Herod Antipas. So also Salome, Herod's sister, divorced her husband. Both Bruce and Gould think that Mark added this item to the words of Jesus for the benefit of the Gentile environment of this Roman Gospel. But surely Jesus knew that the thing was done in the Roman world and hence prohibited marrying such a "grass widow."