Genesis 48:18

18 Yosef said to his father, "Don't do it that way, my father; for this one is the firstborn. Put your right hand on his head."

Genesis 48:18 Meaning and Commentary

Genesis 48:18

And Joseph said unto his father, not so, my father
It is not right, it should not so be, that the right hand should be put on the youngest, and the left hand on the eldest; for this [is] the firstborn;
directing him to Manasseh, and seeking to guide his hand towards him: put thy right hand upon his head;
Joseph was for proceeding according to the order of birthright, but Jacob was directed by a spirit of prophecy, as follows.

Genesis 48:18 In-Context

16 the angel who has rescued me from all harm, bless these boys. May they remember who I am and what I stand for, and likewise my fathers Avraham and Yitz'chak, who they were and what they stood for. And may they grow into teeming multitudes on the earth."

17 When Yosef saw that his father was laying his right hand on Efrayim's head, it displeased him, and he lifted up his father's hand to remove it from Efrayim's head and place it instead on M'nasheh's head.

18 Yosef said to his father, "Don't do it that way, my father; for this one is the firstborn. Put your right hand on his head."

19 But his father refused and said, "I know that, my son, I know it. He too will become a people, and he too will be great; nevertheless his younger brother will be greater than he, and his descendants will grow into many nations."

20 Then he added this blessing on them that day: "Isra'el will speak of you in their own blessings by saying, 'May God make you like Efrayim and M'nasheh.'"Thus he put Efrayim ahead of M'nasheh.