Here is another longer exerpt from a different commentary...
Here is an exerpt of one of the commentaries on this.
The Adoption of Manasseh and Ephraim
(48:1-7)
The last days of JacobÂ’s earthly sojourn drew to a close. Sensing this, Joseph was summoned to his fatherÂ’s side where Jacob pronounced a unique blessing upon him. The death of which Jacob had so frequently spoken and, at one time, desired was now soon to visit him. Joseph took his two sons, Manasseh and Ephraim, along with him to see their grandfather one final time and to bid him farewell. Gathering up his strength, Jacob sat up in bed in order to speak words of vital significance to Joseph. While JacobÂ’s words were reminiscent of the past, this was no muddled musing as one might expect of an aged man nearing his final hour. Instead, Jacob focused JosephÂ’s attention upon the two most important events of his life as an explanation for what he was about to do.
Now it came about after these things that Joseph was told, “Behold, your father is sick.” So he took his two sons Manasseh and Ephraim with him. When it was told to Jacob, “Behold, your son Joseph has come to you,” Israel collected his strength and sat up in the bed. Then Jacob said to Joseph, “God Almighty appeared to me at Luz in the land of Canaan and blessed me, and He said to me, ‘Behold, I will make you fruitful and numerous, and I will make you a company of peoples, and will give this land to your descendants after you for an everlasting possession.’ And now your two sons, 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, as Reuben and Simeon are. But your offspring that have been born after them shall be yours; they shall be called by the names of their brothers in their inheritance” (Genesis 48:1-6).
Twice God had appeared to Jacob at Luz (Bethel, 28:10-17; 35:9-12), and in both appearances God had blessed him, promising him that he would become a great nation and that he would possess the land of Canaan. While it was nowhere recorded that God specifically promised Jacob that the land would be an “everlasting possession” (verse 4), it was told Abram in 17:7. This was probably orally passed on through Isaac.
Joseph’s sons, Manasseh and Ephraim,102 were born in the land of Egypt. As sons of Joseph their future in Egypt may have seemed very bright. Perhaps they might fill the shoes of their father, taking places of power and influence in Pharaoh’s administration. But their greatest hope lay in a land they had not yet seen, for they were destined to be a part of the “company of peoples” (verse 4) that God had promised Jacob.
Reuben, due to his sin of laying with Bilhah, JacobÂ’s concubine (35:22), would be stripped of his birthright (cf. 49:4). This privilege was conveyed upon Joseph, but in an unusual way. No doubt the normal course would have been to give the birthright to the next son, Simeon, or to the next after him, Levi, but both of these sons were guilty of the mass murder of the Shechemites (34:25ff.). It was Joseph instead who was to receive the rights of the firstborn:
Now the sons of Reuben the firstborn of Israel (for he was the firstborn, but because he defiled his fatherÂ’s bed, his birthright was given to the sons of Joseph the son of Israel; so that he is not enrolled in the genealogy according to the birthright. Though Judah prevailed over his brothers, and from him came the leader, yet the birthright belonged to Joseph) (I Chronicles 5:1-2).
Jacob achieved his purpose by adopting both of JosephÂ’s sons as his own, on a par with Reuben and Simeon (verse 5). Now each of them would receive one portion, but in so doing Joseph received a double portion:
And I give you one portion more than your brothers, which I took from the hand of the Amorite with my sword and my bow (Genesis 48:22).
The effect, as noted by the chronicler, was to give the birthright to Joseph. Any other sons which might be born to Joseph (but donÂ’t seem to have been) would receive their inheritance as though they were the sons of either Ephraim or Manasseh (verse 6).
The twin appearances of God to Jacob at Bethel (once before he departed from Canaan to seek a wife in Haran (28:10-17) and once after he returned to Canaan from Paddan-aram (35:9-15)) were even more significant in the light of the partial fulfillment of GodÂ’s promises to him in these appearances. God had promised Jacob that he would be with him to guide, protect, and provide, and that He would bring him safely back to Canaan. This God had done, in spite of the dangers he had faced and the obstacles that were in his path. Since GodÂ’s word had been fulfilled in the short-term promises, surely His more distant promises were assured also.
The primary focus of Jacob in his report to Joseph was the promise of the land of Canaan and the assurance that Jacob would become a numerous people, a company of peoples (verse 4). If God had assured Jacob of becoming a great and numerous people, then surely he was justified in adopting two more sons who would contribute to this proliferation of people.
If the justification for JacobÂ’s adoption of JosephÂ’s sons is found in the promise God had made at Bethel, the reason seems to be reported in verse 7:
Now as for me, when I came from Paddan, Rachel died, to my sorrow, in the land of Canaan on the Journey, when there was still some distance to go to Ephrath; and I buried her there on the way to Ephrath (that is, Bethlehem) (Genesis 48:7).
Joseph was the son of Rachel, Jacob’s chosen wife. His partiality to Joseph significantly contributed to Joseph’s rejection by his brothers and his journey to Egypt (cf. 37:4). A major factor in his preference for Joseph was the fact that he was the first-born of Rachel, his bride by choice. (Leah was his wife “by chance,” Bilhah and Zilpah “by competition.”)
While Rachel was the younger of his wives, she died prematurely on the way to Ephrath (Bethlehem). By inference, had she not died so early in life she would have presented Jacob with many other sons. The adoption of Ephraim and Manasseh provided Jacob with two more sons, technically “through Rachel.” The promise of God at Bethel in combination with the preference of Jacob for Rachel provides the backdrop for the adoption of Ephraim and Manasseh. In addition to this must be mentioned the faithfulness of Joseph to the God of his fathers, even while in a foreign land and in adverse circumstances. He, as the savior of his people, surely was worthy of the favor his father bestowed upon him.
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The View From the Graveyard