JACOB HAD THE FIRSTBORN / BIRTHRIGHT BLESSING

Midrash Rabbah - Numbers 6:2

TAKE THE SUM OF, etc (Numbers 4:22).

Hence it is written, He withdraws not His eyes from the righteous, etc. (Job 36:7) which means that the Holy One, blessed be He, does not withhold from them some realisation of His ideal. Thus we find that Jacob eagerly desired the birthright for a godly purpose--to wit, that he might be able to offer sacrifices-and so he acquired it from Esau for money. The Holy One, blessed be He, therefore gave him His approval and called him, My son, My firstborn (Exodus 4:22), and conferred upon the firstborn the distinction of offering sacrifices before Him …