Origen

“ It therefore in no way affects either the Jews or us that the Egyptian priests abstain not only from the flesh of swine, but also from that of goats, and sheep, and oxen, and fish. But since it is not that “which entereth into the mouth that defiles a man,” and since “meat does not commend us to God,” we do not set great store on refraining from eating, nor yet are we induced to eat from a gluttonous appetite. And therefore, so far as we are concerned, the followers of Pythagoras, who abstain from all things that contain life may do as they please ”