All Egyptians sacrifice unblemished bulls and bull-calves; they may not sacrifice cows: these are sacred to Isis. [2] For the images of Isis are in woman’s form, horned like a cow, exactly as the Greeks picture Io, and cows are held by far the most sacred of all beasts of the herd by all Egyptians alike. [3] For this reason, no Egyptian man or woman will kiss a Greek man, or use a knife, or a spit, or a cauldron belonging to a Greek, or taste the flesh of an unblemished bull that has been cut up