Genesis 48:5

48:5 “Now, as for your two sons, who were born to you in the land of Egypt before I came to you in Egypt, they will be mine. Ephraim and Manasseh will be mine just as Reuben and Simeon are.

Deuteronomy 33:17

33:17 May the firstborn of his bull bring him honor,

and may his horns be those of a wild ox;

with them may he gore all peoples,

all the far reaches of the earth.

They are the ten thousands of Ephraim,

and they are the thousands of Manasseh.