John Chrysostom
"For those who are pure," the apostle states, "all things are pure." Do you grasp the implication of the earlier statement? "To those who are defiled and unfaithful," he notes, "nothing is clean" (Titus 1:15). This brings us to the question of the swine: why was it deemed unclean and forbidden for consumption? It cannot be inherently unclean, since all creation is declared clean by nature; otherwise, one would have to argue that fish, which also consumes human detritus, is the most unclean of all, yet it was allowed and regarded as clean. Similarly, one could argue that a hen, which feeds on worms, or a deer, named for its consumption of serpents, are less pure, yet these animals were available for eating. So, why were swine and a few others designated as unclean? It was not due to their nature but rather to curb excess and gluttony. Had God explicitly commanded this, the Israelites might have resisted; instead, through the fear of uncleanness, He guided their actions.