Genesis 48:19-20

19But his father refused and said, “I know, my son, I know! He too will become a tribe, and he too will be great; nevertheless, his younger brother will be greater than he, and his offspring will become a populous nation.”

20So he blessed them that day, putting Ephraim before Manasseh when he said, “The nation Israel will invoke blessings by you, saying, ‘May God make you like Ephraim and Manasseh.’”