Musar zu Bamidbar 29:14

We have been handed over to the dominion of a force which after all originated in the regions of sanctity and purity, i.e. we have been subjected to their ראש, which is metaphor for their origin in Holy Spheres. These pagans are not allowed, however, to have sin-offerings presented on their behalf on the altar of the Holy Temple because their sin-offerings are impurity personified. All of this is the mystical dimension of the 70 bulls the Jewish people offered on behalf of the Gentile nations during the course of the holiday of Tabernacles as described in Numbers 29,14-34. It will be explained there in greater detail. While we have said that Esau was first-born from the physical aspect, i.e. that he was born first, we nonetheless look forward to the time of the redemption when it is he who will become the עקב, heel, not Jacob. When the Torah describes Jacob as holding on to the heel of Esau in Genesis 25,27, this is an allusion to Esau being the last of the שרים to have dominion over Israel at any time.