Genesis 48:18

18 And Joseph said to his father, "Not so, 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 redeemed me from all evil, Bless the lads; Let my name be named upon them, And the name of my fathers Abraham and Isaac; And let them grow into a multitude in the midst of the earth."

17 Now when Joseph saw that his father laid his right hand on the head of Ephraim, it displeased him; so he took hold of his father's hand to remove it from Ephraim's head to Manasseh's head.

18 And Joseph said to his father, "Not so, my father, for this one is the firstborn; put your right hand on his head."

19 But his father refused and said, "I know, my son, I know. He also shall become a people, and he also shall be great; but truly his younger brother shall be greater than he, and his descendants shall become a multitude of nations."

20 So he blessed them that day, saying, "By you Israel will bless, saying, 'May God make you as Ephraim and as Manasseh!' " And thus he set Ephraim before Manasseh.