Genesis 25:1

1.Then again Abraham took a wife (15) It seems very absurd that Abraham, who is said to have been dead in his own body thirty-eight years before the decease of Sarah, should, after her death, marry another wife. such an act was, certainly, unworthy of his gravity. Besides, when Paul commends his faith, (Romans 4:19,) he not only asserts that the womb of Sarah was dead, when Isaac was about to be born, but also that the body of the father himself was dead. Therefore Abraham acted most foolishly, if, after the loss of his wife, he, in the decrepitude of old age, contracted another marriage. Further, it is at variance with the language of Paul, that he, who in his hundredth year was cold and impotent, (16) should, forty years afterwards, have many sons. Many commentators, to avoid this absurdity, suppose Keturah to have been the same person as Hagar. But their conjecture is immediately refuted in the context; where Moses says, Abraham gave gifts to the sons of his concubines. The same point is clearly established from 1 Chronicles 1:32. Others conjecture that, while Sarah was yet living, he took another wife. This, although worthy of grave censure, is however not altogether incredible. We know it to be not uncommon for men to be rendered bold by excessive license. Thus Abraham having once transgressed the law of marriage, perhaps, after the dispute respecting Hagar, did not desist from the practice of polygamy. It is also probable that his mind had been wounded, by the divorce which Sarah had compelled him to make with Hagar. Such conduct indeed was disgraceful, or, at least, unbecoming in the holy patriarch. Nevertheless no other, of all the conjectures which have been made, seems to me more probable. If it be admitted, the narrative belongs to another place; but Moses is frequently accustomed to place those things which have precedence in time, in a different order. And though this reason should not be deemed conclusive, yet the fact itself shows an inverted order in the history. (17) Sarah had passed her ninetieth year, when she brought forth her son Isaac; she died in the hundred and twenty-seventh year of her age; and Isaac married when he was forty years old. Therefore, nearly four years intervened between the death of his mother and his nuptials. If Abraham took a wife after this, what was he thinking of, seeing that he had been during so many years accustomed to a single life? It is therefore lawful to conjecture that Moses, in writing the life of Abraham, when he approached the closing scene, inserted what he had before omitted. The difficulty, however, is not yet solved. For whence proceeded Abraham’s renovated vigor, (18) since Paul testifies that his body had long ago been withered by age? Augustine supposes not only that strength was imparted to him for a short space of time, which might suffice for Isaac’s birth; but that by a divine restoration, it flourished again during the remaining term of his life. Which opinion, both because it amplifies the glory of the miracle, and for other reasons, I willingly embrace. (19) And what I have before said, namely, that Isaac was miraculously born, as being a spiritual seed, is not opposed to this view; for it was especially on his account that the failing body of Abraham was restored to vigor. That others were afterwards born was, so to speak, adventitious. Thus the blessing of God pronounced in the words, “Increase and multiply,” which was annexed expressly to marriage, is also extended to unlawful connexions. Certainly, if Abraham married a wife while Sarah was yet alive, (as I think most probable,) his adulterous connection was unworthy of the divine benediction. But although we know not why this addition was made to the just measure of favor granted to Abraham, yet the wonderful providence of God appears in this, that while many nations of considerable importance descended from his other sons, the spiritual covenant, of which the rest also bore the sign in their flesh, remained in the exclusive possession of Isaac.