The laughter of Hagar's boy at Sarah's weaning-feast seems but a slight offence to be visited with the punishment of expulsion; and the incident one beneath the dignity of theological argument. But the principle for which Paul contends is there; and it is the more easily apprehended when exhibited on this homely scale. The family is the germ and the mirror of society. In it are first called into play the motives which determine the course of history, the rise and fall of empires or churches. The gravamen of the charge against Ishmael lies in the last word of Gen. xxi. 9, rendered in the Authorized Version _mocking_, and by the Revisers _playing_, after the Septuagint and the Vulgate. This word in the Hebrew is evidently a play on the name _Isaac_, _i.e._, _laughter_, given by Sarah to her boy with genial motherly delight (vv. 6, 7). Ishmael, now a youth of fourteen, takes up the child's name and turns it, on this public and festive occasion, into ridicule. Such an act was not only an insult to the mistress of the house and the young heir at a most untimely moment, it betrayed a jealousy and contempt on the part of Hagar's son towards his half-brother which gravely compromised Isaac's future. "The wild, ungovernable and pugnacious character ascribed to his descendants began to display itself in Ishmael, and to appear in language of provoking insolence; offended at the comparative indifference with which he was treated, he indulged in mockery, especially against Isaac, whose very name furnished him with satirical sneers."[126] Ishmael's jest cost him dear. The indignation of Sarah was reasonable; and Abraham was compelled to recognise in her demand the voice of God (vv. 10-12). The two boys, like Esau and Jacob in the next generation, represented opposite principles and ways of life, whose counterworking was to run through the course of future history. Their incompatibility was already manifest.
[126] Kalisch, _Commentary_, on Genesis xxi. 9.
The Apostle's comparison must have been mortifying in the extreme to the Judaists. They are told in plain terms that they are in the position of outcast Ishmael; while uncircumcised Gentiles, without a drop of Abraham's blood in their veins, have received the promise forfeited by their unbelief. Paul could not have put his conclusion in a form more unwelcome to Jewish pride. But without this radical exposure of the legalist position it was impossible for him adequately to vindicate his gospel and defend his Gentile children in the faith.