פירוש על בראשית 48:20

בך יברך ישראל IN THEE SHALL ISRAEL BLESS — When one wishes to bless his sons he will bless them by reciting the formula with which they were blessed — a man will say to his son, “God make thee as Ephraim and as Manasseh.”

AND HE BLESSED THEM THAT DAY. The meaning of that day is that since Joseph had urged him to give Menasheh precedence, the verse declares that Jacob did not wish to remove his right hand from Ephraim’s head to that of Menasheh. Moreover, he expressly reiterated on that occasion, in Joseph’s presence, when he blessed them by saying, As Ephraim and Menasheh. And he put Ephraim before Menasheh in all his blessings.

בך יברך ישראל, each Israelite his respective son.