9. And Sarah saw the son of Hagar. As the verb to laugh has a twofold signification among the Latins, so also the Hebrews use, both in a good and evil sense, the verb from which the participle מצחק ( metsachaik) is derived. That it was not a childish and innoxious laughter, appears from the indignation of Sarah. It was, therefore a malignant expression of scorn, by which the forward youth manifested his contempt for his infant brother. And it is to be observed, that the epithet which is here applied to Ishmael, and the name Isaac, are both derived from the same root. Isaac was, to his father and others, the occasion of holy and lawful laughter; whence also, the name was divinely imposed upon him. Ishmael turns the blessing of God, from which such joy flowed, into ridicule. Therefore, as an impious mocker, he stands opposed to his brother Isaac. Both (so to speak) are the sons of laughter: but in a very different sense. Isaac brought laughter with him from his mother’s womb, since he bore, — engraven upon him, — the certain token of God’s grace. He therefore so exhilarates his father’s house, that joy breaks forth in thanksgiving; but Ishmael, with canine and profane laughter, attempts to destroy that holy joy of faith. And there is no doubt that his manifest impiety against God, betrayed itself under this ridicule. He had reached an age at which he could not, by any means be ignorant of the promised favor, on account of which his father Abraham was transported with so great joy: and yet — proudly confident in himself — he insults, in the person of his brother, both God and his word, as well as the faith of Abraham. Wherefore it was not without cause that Sarah was so vehemently angry with him, that she commanded him to be driven into exile. For nothing is more grievous to a holy mind, than to see the grace of God exposed to ridicule. And this is the reason why Paul calls his laughter persecution; saying,
‘He who was after the flesh persecuted the spiritual seed.’ (Galatians 4:29.)
Was it with sword or violence? Nay, but with the scorn of the virulent tongue, which does not injure the body, but pierces into the very soul. Moses might indeed have aggravated his crime by a multiplicity of words; but I think that he designedly spoke thus concisely, in order to render the petulance with which Ishmael ridicules the word of God the more detestable.