Clement of Alexandria

It is then proper that the barbarian philosophy, on which it is our business to speak, should prophesy also obscurely and by symbols, as was evinced. Such are the injunctions of Moses: "These common things, the sow, the hawk, the eagle and the raven, are not to be eaten." For the sow is the emblem of voluptuous and unclean lust of food and lecherous and filthy licentiousness in venery, always prurient, and material, and lying in the mire and fattening for slaughter and destruction.

The Stromata Book 5 ↗