1. As a test of obedience, and to teach the Israelites habits of self-denial, and the government of their appetites.

2. To keep them distinct from other nations, and consequently from their idolatrous usages, by throwing hindrances in the way of their social intercourse; for these distinctions were applicable both to persons and things. The Canaanites not only ate the animals prohibited by Moses, which we usually eat, but others also, among which dogs were one. Besides, many of those declared unclean were sacred among the heathen, and sacrificed to their gods.

3. Because those prohibited were innutritive and unwholesome; as the swine, the flesh of which being strong and difficult to digest, affords a very gross aliment, and produces, especially in hot climates, cutaneous, scrophulous, and scorbutic disorders, as the itch, leprosy, etc.

Lévitique 7:37
Telle est la loi de l'holocauste, de l'offrande, du sacrifice d'expiation, du sacrifice de culpabilité, de la consécration, et du sacrifice d'actions de grâces.

Lévitique 14:54
Telle est la loi pour toute plaie de lèpre et pour la teigne,

Lévitique 15:32
Telle est la loi pour celui qui a une gonorrhée ou qui est souillé par une pollution,

Ézéchiel 43:12
Telle est la loi de la maison. Sur le sommet de la montagne, tout l'espace qu'elle doit occuper est très saint. Voilà donc la loi de la maison.