Genesis 48:19-20

19His father refused and said, “I know, Son, I know! Manasseh, too, will become a nation, and he, too, will be important. Nevertheless, his younger brother will be more important than he, and his descendants will become many nations.”

20That day he blessed them. He said, “Because of you, Israel will speak this blessing, ‘May God make you like Ephraim and Manasseh!’ ” In this way Israel put Ephraim ahead of Manasseh.