Midrash su Genesi 43:30

“From the day my brother Joseph disappeared, my father forsook his bed, and sat and slept only on the ground. Furthermore, whenever I saw my brothers sitting side by side, while I was forced to sit alone, my eyes welled up with tears.” At that moment, Joseph’s compassion toward him was stirred, as it is said: And Joseph made haste; for his heart yearned for his brother (Gen. 43:30). R. Nahman the son of Isaac explained: He then arranged a banquet for them at which he decided to have Benjamin sit at his side, but he did not know, at first, how to accomplish it. Whereupon, he took the goblet, struck it, and said to them: “I was of the opinion that Judah was the firstborn, since he was the first to speak, but now I discover that Reuben is the firstborn, and that Judah is simply a garrulous individual.” And he sat Reuben at the head of the table. Then he took the goblet once again, struck it, and told Simeon: “Sit alongside of him, for you are the second son.” He likewise seated Levi, Judah, and all the rest according to their ages. Then he took the goblet once again, struck it, and declared: “I have discovered through this cup that you are all the sons of one father, but that your father had a number of wives.” He then told Dan and Naphtali to be seated according to their ages. At last, only Benjamin remained unseated. “I see that this one had a brother, from whom he is separated, and that he is an orphan.⁴Their mother, Rachel was already dead. I too had a brother from whom I am separated. He is an orphan, and I too am an orphan. Let him come and sit beside me.” And he sat him at his side, as Scripture says: And they sat before him, the firstborn according to his birthright, and the youngest according to his youth (Gen. 43:33).