Clement of Alexandria

Among the Jews, frugality was made a matter of precept by a very wise dispensation of the law. The Educator forbade them the use of innumerable things. He explained the reasons, the spiritual ones hidden, the material ones obvious, but all of which they trusted. Some animals [were forbidden] because they were [not] cloven-footed; others, because they did not ruminate their food; a third class, because they, alone among all the fish of the seas, had no scales; until finally there were only a few things left fit for food. …

The Instructor Book 2 ↗