Kommentar zu Bereschit 35:12

AND THE LAND WHICH I GAVE UNTO ABRAHAM AND ISAAC, TO THEE I WILL GIVE IT. “As I have given it to them so will I give it to you.” This alludes to an oath, for the land was given to them with an oath so that sin should not cause annulment of the gift, but to Jacob it was originally given without an oath. It is this which Scripture refers to when it says in all places, the land of which I swore unto Abraham, to Isaac, and to Jacob.¹⁹⁸Exodus 33:1. and elsewhere. But nowhere do we find that G-d swore to Jacob, except as implied in this verse. It may that the repetition of the prophecy, [mentioned above, 28:13, and repeated here], constitutes an oath, as I have already explained.¹⁹⁹Above, 26:3.

ולזרעך אחריך אתן את הארץ, in due course, at the end of time, I will give your descendants the entire globe, not only the land of Israel. This was the real meaning of 28,14 “you will spread out to the west to the east and to the north and to the south.” This is also what Bileam prophesied when he said in Numbers 24,17 that Yaakov would uproot all the descendants of Seth, i.e. all of mankind.

לאברהם וליצחק, to Abraham and Isaac. Check on what we have written on Genesis 26,3 that the promise G'd made to Isaac concerning inheriting the land of Israel contained an additional dimension to the promise made to Abraham. G'd promised this additional dimension also to Jacob.