פּירוש אויף בראשית 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).

וישבו לפניו, Joseph had given instructions to arrange the seating order in order of their birth.

וישבו לפניו, in the order in which Joseph had given instructions to seat them.