And they served him by himself, and them by themselves, and for the Egyptians, who did eat with him, by themselves: because the Egyptians might not eat bread with the Hebrews; for that is an abomination unto the Egyptians.
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George Leo Haydock
Hebrews. "They had the same aversion for all who did not adopt their superstition. "(Porphyrius, Abstin. iv.) Herodotus, ii. 41, says, they would not use a knife which had been in the hands of a Greek, nor kiss him. This aversion arose, from their custom of abstaining from various meats which other nations eat. (Chaldean;) They disliked the Hebrews, because they were also shepherds, chap. xlvi. 34 (Calmet); and because they knew they were accustomed to eat goats, oxen, and sheep, the objects of adoration in Egypt, (Exodus viii. 26): though they were not, probably, served upon Joseph's table. (Tirinus)
They who dwelt in the towns could not bear even the Egyptian shepherds, because they were of a more stirring and warlike temper. (Calmet) (Cunæus)