Genesis 25:31

“And Jacob said, sell me this day thy birthright.] Which had many privileges annexed to it, as honour and authority in the family next to parents; a double portion of inheritance; some say the exercise of priesthood, but that is questioned; the parental blessing, and especially in this the promises of the Messiah, and of inheritance of the land of Canaan, and which was typical of the heavenly inheritance: all which Rebekah knew by the divine oracle were designed for Jacob, and which no doubt she had acquainted him with, and advised him to deal with his brother about parting with his birthright as he had opportunity; and very likely they had talked together about it before in a distant manner,…”

“Jacob said, Sell me . . . thy birthright--that is, the rights and privileges of the first-born, which were very important, the chief being that they were the family priests (Exo 4:22) and had a double portion of the inheritance (Deu 21:17).”

“25:31-33 Jacob was the better hunter on this occasion, but great danger lay in exercising such strong ambition. God’s people should desire the things of God, but they must not seek them in the flesh (see Zech 4:6; Gal 5:16-17; Eph 6:10-12). The Lord dealt severely with Jacob to purge him of carnal methods. He later received the promise not as crafty Jacob the usurper, but as Israel (meaning, “God fights”), with God fighting on his behalf (Gen 32:28).”