Genesis 43:32-33

32So the servants served Joseph by himself [in honor of his rank], and his brothers by themselves, and the Egyptians who ate with him by themselves, because [according to custom] the Egyptians could not eat food with the Hebrews, for that is loathsome to the Egyptians.

33Now Joseph’s brothers were seated [by the steward] before him [in the order of their birth]—the firstborn according to his birthright and the youngest according to his youth; and the men looked at one another in astonishment [because so much was known about them].