Genesis 48:15-20

Then he blessed Joseph and said, “May the God before whom my fathers Abraham and Isaac walked faithfully, the God who has been my shepherd all my life to this day, the Angel who has delivered me from all harm —may he bless these boys. May they be called by my name and the names of my fathers Abraham and Isaac, and may they increase greatly on the earth.” When Joseph saw his father placing his right hand on Ephraim’s head he was displeased; so he took hold of his father’s hand to move it from Ephraim’s head to Manasseh’s head. Joseph said to him, “No, my father, this one is the firstborn; put your right hand on his head.” But his father refused and said, “I know, my son, I know. He too will become a people, and he too will become great. Nevertheless, his younger brother will be greater than he, and his descendants will become a group of nations.” He blessed them that day and said, “In your name will Israel pronounce this blessing: ‘May God make you like Ephraim and Manasseh.’ ” So he put Ephraim ahead of Manasseh.