Musar su Genesi 37:31

And Chazal say concerning this in the Midrash (Midrash Rabbah): "(Mishlei 16:11): 'A scale and just balances are the L-rd's' — for all of them he was punished measure for measure. For 'they call their brothers servants' — Jacob was sold as a servant. For 'they are suspect of illicit relations' — all of Egypt suspected him with the wife of Potiphar. For 'they are suspect of eiver min hachai' because he did not see them perform shechitah — this was a mistake, and Scripture thus apprises us (Bereshith 37:3): 'And they slaughtered a kid of goats' (after having sold him) and did not eat it live."

We explained that those letters signified death, i.e. the spilling of man's blood. The removal of the letter א caused the substitution of the letter ע. This meant that עור ובשר, skin and flesh, replaced the entity previously called אדם, and death in the form of blood entered the world. Expressed differently, Adam's כתונת was removed. When Jacob provided Joseph with a כתונת, this symbolized the reversal of that negative development. When the brothers dipped that כתונת, coat, in blood, they symbolically nullified Jacob's intention. As a result of this, the Holy Spirit departed from Jacob; he remained in mourning, and until he received the news that Joseph was alive the Presence of the שכינה did not return to him. Only then does the Torah state: ותחי רוח יעקב אביהם, "Jacob's (holy) spirit revived" (45,27). Onkelos translates those words as: "The prophetic spirit again came to rest on their father Jacob." It is reasonable to assume that the Holy Spirit departed from Joseph at the time it departed from Jacob. No doubt Joseph experienced emotional distress, if only because he felt the distress his father must have experienced by not knowing his favorite son's whereabouts. Besides, how could Joseph, who was the spiritual extension of Jacob, not be sensitive to his father's anguish? Jacob's descent to Egypt must also be seen from this angle, i.e. two parts becoming re-united. [It was politically impossible for Joseph to return to the land of Canaan while alive, since we know that he could not even be buried in Canaan after he died. Ed.]