John Chrysostom
But was Esau a fornicator? He does not say here that Esau was a fornicator. Rather, he sets this in contrast to the words, “Pursue peace with all and holiness.” The word “profane” applies to him.
Therefore let no one be, like Esau, a defiler, that is, a glutton, an incontinent man, devoted to the world, and one who despises spiritual goods.
Such a man, like Esau, for one morsel renounced his birthright. That is, through his own carelessness he gave away the honor given by God, and for a small pleasure lost the greatest honor and glory.
This applies properly to them, the Hebrews, and is characteristic of base and impure people. Not only the adulterer is impure, but also the glutton, who is a slave of the belly.
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He is also the slave of another pleasure, which compels him to give himself over to covetousness, to seize what belongs to others, and to commit many dishonorable acts. Being a slave of this passion, he often even blasphemes.
Esau counted the birthright as nothing and, caring for temporary enjoyment, went so far as to sell his birthright. Thus the birthright now belongs to us, and not to the Jews.
This at the same time relates to their sufferings. The Apostle seems to suggest that the first became last, and the second first. The latter became first through self-control, and the former last through carelessness.