Genesis 43:33

הבכור כבכרתו THE FIRST-BORN ACCORDING TO HIS BIRTHRIGHT — He struck the goblet and called aloud: Reuben, Simeon, Levi, Judah, Issachar and Zebulon, sons of one mother, take your seats at the table in this order which is the order in which you were born — and similarly in the case of them all. When he reached Benjamin’s name he said, “This one has no mother and I have no mother — let him sit beside me” (Genesis Rabbah 92:5).

וַיֵּשְׁב֣וּ לְפָנָ֔יו הַבְּכֹר֙ כִּבְכֹ֣רָת֔וֹ וְהַצָּעִ֖יר כִּצְעִרָת֑וֹ וַיִּתְמְה֥וּ הָאֲנָשִׁ֖ים אִ֥ישׁ אֶל־רֵעֵֽהוּ׃

And they sat before him, the firstborn according to his birthright, and the youngest according to his youth: and the men marvelled one at another.