Genesis 48:18

18 and Joseph saith unto his father, `Not so, my father, for this [is] the first-born; set thy 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 Messenger who is redeeming me from all evil doth bless the youths, and my name is called upon them, and the name of my fathers Abraham and Isaac; and they increase into a multitude in the midst of the land.'
17 And Joseph seeth that his father setteth his right hand on the head of Ephraim, and it is wrong in his eyes, and he supporteth the hand of his father to turn it aside from off the head of Ephraim to the head of Manasseh;
18 and Joseph saith unto his father, `Not so, my father, for this [is] the first-born; set thy right hand on his head.'
19 And his father refuseth, and saith, `I have known, my son, I have known; he also becometh a people, and he also is great, and yet, his young brother is greater than he, and his seed is the fulness of the nations;'
20 and he blesseth them in that day, saying, `By thee doth Israel bless, saying, God set thee as Ephraim and as Manasseh;' and he setteth Ephraim before Manasseh.
Young's Literal Translation is in the public domain.