It is undeniably plain, that both these Scriptures [verses 12 and 13] relate, not to the persons of Jacob and Esau, but to their descendents; the Israelites sprung from Jacob, and the Edomites sprung from Esau. In this sense only did “the elder” (esau) “serve the younger”; not in his person (for Esau never served Jacob) but in his posterity. This posterity of the elder brother served the posterity of the younger.

