Myśl Żydowska do Wyjścia 6:20

Behold I saw fit to expand a bit in this way in order to resolve the question that Ramban, may his memory be blessed, raised in Parashat Toledot about their midrashic statements (Bereishit Rabbah 95:2) that the forefathers kept all of the Torah. It is, as they, may their memory be blessed, expounded on [the verse]: Inasmuch as Abraham obeyed Me and kept My charge, etc. (Genesis 26:5). And there Ramban wrote, "And one can ask, 'If so, how did Jacob set up a pillar (Genesis 28:18), and marry sisters; and Amram marry his aunt (Exodus 6:20); and Moses set up twelve pillars (Exodus 24:4)? And how is it possible that they should act [as if what is forbidden] in the Torah is permissible, which Abraham, our father, forbade upon himself; and that God, may He be exalted, [gave] him reward upon the matter — and that is that he commanded his children and his household after him to walk in His ways? And with Jacob, they expounded (Bereshit Rabbah 79:6) that he kept the Shabbat and established boundaries (within which he would be allowed to walk on Shabbat).'" And Ramban answered that "Abraham only kept the Torah in the land [of Israel], and Jacob [accordingly only] married sisters outside the land, and likewise Amram, etc." — as he wrote at length there. But I wonder about this since we do not find that Jacob divorced his wives upon coming to the land. And after Rachel died, he remained with Bilhah and Zilpah, who were also sisters according to the opinion of our rabbis, may their memory be blessed (Bereishit Rabbah 74:13:14).