Genesis 48:1, 5

Now some time after these things happened, Joseph was told, “Your father is sick.” So he took his two sons Manasseh and Ephraim with him [to go to Goshen].

Now your two sons [Ephraim and Manasseh], who were born to you in the land of Egypt before I came to you in Egypt, are mine; Ephraim and Manasseh shall be mine [that is, adopted as my heirs and sons as surely], as Reuben and Simeon are my sons.