פירוש על בראשית 36:7

ולא יכלה ארץ מגוריהם AND THE LAND OF THEIR SOJOURNINGS COULD NOT — supply sufficient pasture for the cattle which they had. A Midrashic comment (Genesis Rabbah 82:13) on מפני יעקב אחיו [HE WENT TO A COUNTRY] ON ACCOUNT OF HIS BROTHER JACOB is: on account of the bond of indebtedness involved in the decree, (Genesis 14:13) “thy seed shall be a stranger etc… and they shall afflict them etc.” that was imposed upon Isaac’s descendants. He said, “I shall go hence — I desire no part either in the gift of this land which has been made to him (to my father) nor in the payment of this bond" . Another reason why he went away was on account of the shame he felt at having sold his birthright (cf. Genesis Rabbah 82:13).

AND THE LAND OF THEIR SOJOURNINGS. The meaning thereof is “the city of their sojournings,” which is Hebron, where Abraham and Isaac sojourned,²⁵⁸Above, 35:27. for the land of Canaan could support a thousand times more than Jacob and Esau. But when Esau saw that he could not stay in his city and in his place, he left the entire country to his brother and went his way.

ולא יכלה ארץ מגוריהם לשאת אותם, “and the land of their sojourning could not support them (their combined wealth of livestock).” The word ארץ, “land,” is used here very loosely, the reference being to the city of Chevron and its immediate surroundings. The Torah most certainly does not wish to imply that the whole land of Canaan was inadequate for these two families and their livestock. The point was that when Esau saw that he could not remain in his home town as it did not offer a good enough economic base for him, he decided to migrate.

Due to the shame that he sold his birthright. Rashi is saying: This is an additional reason [for his leaving].