Genesis 46:4
I will go down with thee into Egypt; and I will also surely bring thee up again: and Joseph shall put his hand upon thine eyes. I will go down with thee into Egypt; and I will also surely bring thee up again: and Joseph shall put his hand upon thine eyes.
The verse stands in the history that began with Joseph's prediction of seven years of dearth, when famine came upon all lands while bread remained in Egypt and extended to Canaan where Jacob lived, leading ten of Jacob's sons to journey to Egypt to buy grain. They came before Joseph as ruler of the land and bowed with faces to the earth, and Joseph knew them while they did not know him, since his Hebrew name had been exchanged and he had become prime minister of Egypt, no longer the youth sold to the Ishmaelites. When he saw them stooping in obeisance, his dreams came to his mind.
Jacob had begun the journey to Egypt with gladness of heart but stopped at Beersheba to offer grateful sacrifices and to pray for blessing, for knowledge of God's will, and for evidence that the move pleased God and that God would go with them. God answered Jacob at Beersheba in visions of the night, calling Jacob by name. In that answer God identified Himself as the God of Jacob's fathers and told Jacob not to fear going down into Egypt.
God promised to go down with Jacob into Egypt and to accompany him there. God promised to make Jacob and his family into a great nation in Egypt. God promised that He would also surely bring Jacob up again from Egypt. God promised that Joseph would be with Jacob at his death and would close his eyes.
Egypt was suited to making the descendants a great nation because its fertile, available land allowed the family to grow quickly, while Egyptian hostility toward shepherds helped keep them separate from the Egyptians and their idolatry. Joseph's joyful reunion with his father fulfilled the promise that they would meet.