Origen

“ But what sort of being is this Ammon of Herodotus, whose words Celsus has quoted, as if by way of demonstrating how each one ought to keep his country’s laws? For this Ammon would not allow the people of the cities of Marea and Apis, who inhabit the districts adjacent to Libya, to treat as a matter of indifference the use of cows’ flesh, which is a thing not only indifferent in its own nature, but which does not prevent a man from being noble and virtuous. ”

“ Celsus, moreover, says that no wrong is committed by any one who wishes to observe the religious worship sanctioned by the laws of his country; and it follows, according to his view, that the Scythians commit no wrong, when, in conformity with their country’s laws, they eat human beings. And those Indians who eat their own fathers are considered, according to Celsus, to do a religious, or at least not a wicked act. He adduces, indeed, a statement of Herodotus which favours the principle that each one ought, from a sense of what is becoming, to obey his country’s laws ”