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.

3.Mose 7:37
Dies ist das Gesetz des Brandopfers, des Speisopfers, des Sündopfers, des Schuldopfers, der Füllopfer und der Dankopfer,

3.Mose 14:54
Das ist das Gesetz über allerlei Mal des Aussatzes und Grindes,

3.Mose 15:32
Das ist das Gesetz über den, der einen Fluß hat und dem der Same im Schlaf entgeht, daß er unrein davon wird,

Hesekiel 43:12
Das soll aber das Gesetz des Hauses sein: Auf der Höhe des Berges, soweit ihr Umfang ist, soll das Allerheiligste sein; das ist das Gesetz des Hauses.