(47) To make a difference.--Better, that ye may put difference, as the Authorised Version renders the same word in Leviticus 10:10. That is, the design of the dietary law is to enable both the administrators of the law and the people to distinguish, by the characteristics and criteria specified above, between what is clean and unclean.

And between the beast that may be eaten.--From the fact that the same word, "beast," is used in both clauses with regard to the animal which may be eaten and the one which may not be eaten without the qualifying adjunct "clean" and "unclean," the administrators of the law during the second Temple concluded that the same clean animal is meant in both instances, under different conditions. The clean animal may be eaten when it is in a healthy state, but the same animal may not be eaten when it has organic defects, or is diseased. Hence they enacted the following canon: an animal is perfectly sound when it is capable of conceiving and bringing forth young. This is the reason why the LXX. renders the word beast here by viviparous.

11:1-47 What animals were clean and unclean. - These laws seem to have been intended, 1. As a test of the people's obedience, as Adam was forbidden to eat of the tree of knowledge; and to teach them self-denial, and the government of their appetites. 2. To keep the Israelites distinct from other nations. Many also of these forbidden animals were objects of superstition and idolatry to the heathen. 3. The people were taught to make distinctions between the holy and unholy in their companions and intimate connexions. 4. The law forbad, not only the eating of the unclean beasts, but the touching of them. Those who would be kept from any sin, must be careful to avoid all temptations to it, or coming near it. The exceptions are very minute, and all were designed to call forth constant care and exactness in their obedience; and to teach us to obey. Whilst we enjoy our Christian liberty, and are free from such burdensome observances, we must be careful not to abuse our liberty. For the Lord hath redeemed and called his people, that they may be holy, even as he is holy. We must come out, and be separate from the world; we must leave the company of the ungodly, and all needless connexions with those who are dead in sin; we must be zealous of good works devoted followers of God, and companions of his people.
]To make a difference between the unclean and the clean,.... Whether of beasts, fish, fowl, and flying creeping things:

and between the beast that may be eaten, and the beast that may not be eaten; the former clause takes in all in general, this instances in a particular sort of creatures; and the first mentioned of which, that might be eaten, are, that part the hoof, are cloven footed, and chew the cud; and that might not, that chew the cud, but divide not the hoof, or divide the hoof, but chew not the cud; and now, by such like descriptions and distinctions of the creatures treated of, the Israelites would be able to make a difference between the one and the other, and know what was to be eaten, and what not.