C. F. Keil and Franz Delitzsch on Genesis 48:1-2

Gen 48:1-2

Adoption of Joseph’s Sons. - Gen 48:1, Gen 48:2. After these events, i.e., not long after Jacob’s arrangements for his burial, it was told to Joseph (ויּאמר “one said,” cf. Gen 48:2) that his father was taken ill; whereupon Joseph went to him with his two sons, Manasseh and Ephraim, who were then 18 or 20 years old. On his arrival being announced to Jacob, Israel made himself strong (collected his strength), and sat up on his bed. The change of names is as significant here as in Gen 45:27-28. Jacob, enfeebled with age, gathered up his strength for a work, which he was about to perform as Israel, the bearer of the grace of the promise.