Commentary on Genesis John Calvin
JOHN CALVIN
towards thee; yet the blessing of God abundantly suffices to obliterate the memory of that time. Perhaps, however, by these words, they again assert that they are acting towards him with good faith, because he is under the guardianship of God.
31. And sware one to another. Isaac does not hesitate to swear; partly, that the Philistines may be the more easily appeased; partly, that he may not be suspected by them. And this is the legitimate method of swearing, when men mutually bind themselves to the cultivation of peace. A simple promise, indeed, ought to have sufficed; but since dissimulations or inconstancy causes men to be distrustful of each other, the Lord grants them the use of his name, that this more holy confirmation may be added to our covenants; and he does not only permit, he even commands us to swear as often as necessity requires it. (Deuteronomy 6:13.) Meanwhile we must beware, lest his name be profaned by rashly swearing.
32. And it came to pass the same day. Hence it appears, (as I have said a little before,) that the waters were not found in a moment of time. If it be asked, whence a supply of water had been obtained for his cattle and his household during the intervening days, I doubt not, indeed, that he either bought it, or was compelled to go to a distance to see if any one would be found from whom he might obtain it by entreaty. With respect to the name, (Sheba,) they are mistaken, in my judgment, who deem it to be any other than that which Abraham had first given to the well. For since the Hebrew word is ambiguous, Abraham alluded to the covenant which he had struck with the king of Gerar; but now Isaac recalling this ancient memorial to mind, joins with it the covenant in which he had himself engaged.
34. And Esau was forty years old. For many reasons Moses relates the marriages of Esau. Inasmuch as he mingled himself with the inhabitants of the land, from whom the holy race of Abraham was separated, and contracted affinities by which he became entangled; this was a kind of prelude of his rejection. It happened also, by the wonderful counsel of God, that these daughters-in-law were grievous and troublesome to the holy patriarch (Isaac) and his wife, in order that they might not by degrees become favorable to that reprobate people. If the manners of the people had been pleasing, and they had had good and obedient daughters, perhaps also, with their consent, Isaac might have taken a wife from among them. But it was not lawful for those to be bound together in marriage, whom God designed to be perpetual enemies. For how would the inheritance of the land be secured to the posterity of Abraham, but by the destruction of those among whom he sojourned for a time? Therefore God cuts off all inducements to these inauspicious marriages, that the disunion which he had established might remain. It appears hence, with what perpetual affection Esau was loved by Isaac; for although the holy man justly regarded his son's wives with aversion, and his mind was exasperated against them,