Genesis 25:33

And Jacob said, Swear to me this day; and he sware unto him: and he sold his birthright unto Jacob.

Jacob said, Swear to me this day. An oath is prostituted when it is exacted and given to confirm an improper and sinful contract; and a person is chargeable with additional guilt when, after entering into a sinful engagement, he precipitately confirms it by an oath. This is what Esau did: he despised or cared little about it in comparison of present gratification to his appetite; he threw away his religious privileges for a trifle; and hence, he is stigmatized by the apostle as a "profane person" (Hebrews 12:16; also Philippians 3:19). 'There was never any meat, except the forbidden fruit, so dearly bought as this broth of Jacob' (Dr. Hall). That Esau deserved to be superseded in his honours, in consequence of his irreligious character, cannot be denied nor doubted; because it is principally or solely on this transaction that the charge of "profanity" is founded. But what was justice on the part of God was cruelty on the part of Jacob, who had no right to make Esau the instrument of his own degradation and ruin. Besides, it was impolitic as well as wrong. For he might have concluded, that if God had not ordained him to possess the envied honours, he could never obtain them; and, on the other hand, if it was the decree of Providence, a way would be opened for his obtaining them in due time. Jacob's heart was right, but he sought to secure good ends by bad means.