Let's study the Old Testament...
The birthright was the natural privilege of the firstborn son. Receiving the birthright, the firstborn would become the head of the family, and would have charge of the family, including the family property.
While there is ample historical evidence that there was a man named Jesus of Nazareth who lived in the first century, some question if we can believe His claims to be the Christ, the Son of God.
Most of us are likely familiar with the parallel which has often been noted between the four Gospel Accounts and the four living creatures in the opening vision of the prophet Ezekiel (Ezekiel 1:10). The lion symbolizes supreme strength, kingship; the man, highest intelligence; the ox, lowly service; the eagle, heavenliness, mystery, divinity.