Bereisheet (Genesis): Vayechi > Ch 48
Jacob blesses Joseph and his sons Ephraim & Manasseh
Before dying, Jacob told Joseph: “Ephraim and Manasseh shall be mine like Reuben and Simeon. But your children, if you beget [any] after them, shall be yours; by their brothers' names they shall be called in their inheritance”
Joseph placed Ephraim at Jacob’s left, and Manasseh at his right. But Israel placed his right hand on Ephraim's head, although he was the younger, and placed his left hand on Manasseh's head. Jacob blessed Joseph: "G-d, before Whom my fathers, Abraham and Isaac, walked, G-d Who sustained me as long as I am alive, until this day, may the angel who redeemed me from all harm bless the youths, and may they be called by my name and the name of my fathers, Abraham and Isaac, and may they multiply abundantly like fish, in the midst of the land."
Joseph didn’t like that his father did not place his right hand on Manasseh but his father said, "I know, my son, I know; he too will become a people, and he too will be great. But his younger brother will be greater than he, and his children['s fame] will fill the nations." So he blessed them on that day, saying, "With you, Israel will bless, saying, 'May God make you like Ephraim and like Manasseh,' " and he placed Ephraim before Manasseh.
And Israel said to Joseph, "Behold, I am going to die, and G-d will be with you, and He will return you to the land of your forefathers. And I have given you one portion over your brothers, which I took from the hand of the Amorite with my sword and with my bow."