Firstborn: Birthright of The: Set Aside: That of Manasseh

Then he blessed Joseph and said: “May the God before whom my fathers Abraham and Isaac walked, the God who has been my shepherd all my life to this day, …

These were the sons of Reuben the firstborn of Israel. Though he was the firstborn, his birthright was given to the sons of Joseph son of Israel, because Reuben defiled his father’s bed. So he is not reckoned according to birthright.