The brothers arrive in Canaan. They find their father. They deliver the news. And Jacob cannot hear it.
"They declared to him, saying, Joseph is yet alive, and is ruler over all the land of Mizraim. But his heart was divided, because he did not believe them" (Genesis 45:26). Targum Pseudo-Jonathan preserves the exact phrase — v'alag libeh, his heart was divided, split, staggered — where the English says only "his heart fainted."
Rashi, commenting on this verse, says Jacob's heart was nafug, like a wall that will not let news through. For twenty-two years he has held one fact as granite: his son is dead. That fact has organized his mourning, his prayers, his refusal of comfort (Genesis 37:35). To be told suddenly that the fact is false is not relief. It is vertigo.
The sages are careful here. Jacob's disbelief is not lack of faith. It is the body's protection against a miracle too large to absorb at once. The midrash notes that the brothers' long history of deception compounded the problem. These were the same men who had shown him a bloodied coat twenty-two years earlier. Why should he believe them now?
The Targum's alag — divided — captures the psychological fracture. Part of Jacob wants it to be true. Part of him cannot risk the hope. The patriarch of a covenant sits between two incompatible realities and cannot choose which one to inhabit.
The verse that follows will describe the thing that finally convinces him. Not the testimony of his sons, but the wagons Joseph sent, and the return of the Ruach ha-Kodesh that had left him on the day of the loss. Words could not persuade Jacob. The Spirit could.