There was a prophecy that each son would become a nation and that the older would serve the younger.
Genesis 25:23 23 And the LORD said unto her, Two nations [are] in thy womb, and two manner of people shall be separated from thy bowels; and [the one] people shall be stronger than [the other] people; and the elder shall serve the younger.
I don't know that I'd call that a rejection... it isn't a positive. Maybe you're thinking of something else?
Malachi, and quoted by Paul,
Malachi 1:2-3 KJV
2) I have loved you, saith the LORD. Yet ye say, Wherein hast thou loved us? Was not Esau Jacob's brother? saith the LORD: yet I loved Jacob,
3) And I hated Esau, and laid his mountains and his heritage waste for the dragons of the wilderness.
Romans 9:10-13 KJV
10) And not only this; but when Rebecca also had conceived by one, even by our father Isaac;
11) (For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of him that calleth;)
12) It was said unto her, The elder shall serve the younger.
13) As it is written, Jacob have I loved, but Esau have I hated.
God's love for Jacob is a word showing God's intention for them, just as "Esau I have I hated" signified God's intent for Esau (Edom), "they will build, but I will throw down."
Your earlier question of whether Jesus was "in Adam" is a head-scratcher. I immediately want to answer in the negative, but... the phrase "Son of Man" is a fly in the ointment. How would you answer the question?
I say that no, Jesus was not "in Adam", as, all in Adam die, and Christ did not die. I'd like to give some thought concerning how Jesus' title "Son of Man" relates before replying to that part.
Much love!