וַיֵּשְׁב֣וּ לְפָנָ֔יו הַבְּכֹר֙ כִּבְכֹ֣רָת֔וֹ וְהַצָּעִ֖יר כִּצְעִרָת֑וֹ וַיִּתְמְה֥וּ הָאֲנָשִׁ֖ים אִ֥ישׁ אֶל־רֵעֵֽהוּ׃
I usiedli przed nim, - starszy po starszeństwie swojém, a młodszy po młodości swojej; i zdziwieni spoglądali jeden na drugiego.
Rashi on Genesis
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).
Rashbam on Genesis
וישבו לפניו, Joseph had given instructions to arrange the seating order in order of their birth.
Radak on Genesis
וישבו לפניו, in the order in which Joseph had given instructions to seat them.