Thematic Bible: 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 long to this day, the Angel who has protected me from all harm -- bless these boys. May my name be named in them, and the name of my fathers Abraham and Isaac. May they grow into a multitude on the earth." When Joseph saw that his father placed his right hand on Ephraim's head, it displeased him. So he took his father's hand to move it from Ephraim's head to Manasseh's head. read more.
Joseph said to his father, "Not so, my father, for this is the firstborn. Put your right hand on his head." But his father refused and said, "I know, my son, I know. He too will become a nation and he too will become great. In spite of this, his younger brother will be even greater and his descendants will become a multitude of nations." So he blessed them that day, saying, "By you will Israel bless, saying, 'May God make you like Ephraim and Manasseh.'" So he put Ephraim before Manasseh.

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. Verse ConceptsConcubinesBirthrightsFirstborn Sons