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.

利未記 7:37
這就是燔祭、素祭、贖罪祭、贖愆祭和平安祭的條例，並承接聖職的禮，

利未記 14:54
「這是為各類大痲瘋的災病和頭疥，

利未記 15:32
「這是患漏症和夢遺而不潔淨的，

以西結書 43:12
殿的法則乃是如此：殿在山頂上，四圍的全界要稱為至聖。這就是殿的法則。