Genesis 48:17-20

When Joseph saw that his father had placed his right hand on Ephraim’s head, he thought he had made a mistake, so he took hold of his father’s hand to move it from Ephraim’s head to Manasseh’s, saying, “That’s the wrong head, Father; the other one is the firstborn; place your right hand on his head.” But his father wouldn’t do it. He said, “I know, my son; but I know what I’m doing. He also will develop into a people, and he also will be great. But his younger brother will be even greater and his descendants will enrich nations.” Then he blessed them both