31 And Jacob said, Sell me this day thy birthright.
32 And Esau said, Behold, I am at the point to die: and what profit shall this birthright do to me?
33 And Jacob said, Swear to me this day; and he sware unto him: and he sold his birthright unto Jacob. KJV
as I understood it, in general, but in Jacob's case three of his 12 sons inherited important elements of his substance: Aaron of the tribe of Levi inherited the priesthood,
10 And the cloths of service, and the holy garments for Aaron the priest, and the garments of his sons, to minister in the priest's office, KJV
Joseph inherited the righteous seed
24 But his bow abode in strength, and the arms of his hands were made strong by the hands of the mighty God of Jacob; (from thence is the shepherd, the stone of Israel:) KJV
and Judah inherited the Government.
2 Sam 5:3
3 So all the elders of Israel came to the king to Hebron; and king David made a league with them in Hebron before the LORD: and they anointed David king over Israel. KJV
Today, all three elements/ministries of the substance that God gave to Abram, reside in one Son, the glorified Jesus Christ,
16 Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. KJV
and in Christ Jesus in the individual.