Genesis 48:15-20

15And he blessed Joseph and said, “The God before whom my fathers Abraham and Isaac walked, the God who has been my shepherd all my life long to this day, 16the angel who has redeemed me from all evil, bless the boys; and in them let my name be carried on, and the name of my fathers Abraham and Isaac; and let them grow into a multitude in the midst of the earth.” 17When Joseph saw that his father laid his right hand on the head of Ephraim, it displeased him, and he took his father’s hand to move it from Ephraim’s head to Manasseh’s head. 18And Joseph said to his father, “Not this way, my father; since this one is the firstborn, put your right hand on his head.” 19But his father refused and said, “I know, my son, I know. He also shall become a people, and he also shall be great. Nevertheless, his younger brother shall be greater than he, and his offspring shall become a multitude of nations.” 20So he blessed them that day, saying, “By you Israel will pronounce blessings, saying, ‘God make you as Ephraim and as Manasseh.’” Thus he put Ephraim before Manasseh.