Esau exclaimed, “‘Jacob’ is the right name for him! He has tripped me up two times! He took away my birthright, and now, look, he has taken away my blessing!” Then he asked, “Have you not kept back a blessing for me?”
The sons of Reuben, Israel’s firstborn – (Now he was the firstborn, but when he defiled his father’s bed, his rights as firstborn were given to the sons of Joseph, Israel’s son. So Reuben is not listed as firstborn in the genealogical records.
In the day he divides his inheritance he must not appoint as firstborn the son of the favorite wife in place of the other wife’s son who is actually the firstborn.
Rather, he must acknowledge the son of the less loved wife as firstborn and give him the double portion of all he has, for that son is the beginning of his father’s procreative power – to him should go the right of the firstborn.