Leviticus 11:2

2.These are the beasts which ye shall eat. The holy fathers, before the birth of Moses, knew what animals were unclean; of which fact Noah afforded a manifest proof, when, by God’s command, he took into the ark seven pairs of the clean animals, and offered of them his sacrifice of thanksgiving to God. Certainly he could not have obeyed the command of God, unless he had either been taught by secret inspiration, or unless this tradition had descended to him from his forefathers. But there is nothing absurd in the notion that God, desiring to confirm the traditional distinction, appointed certain marks of difference whereby its observation might be more scrupulously attended to, and lest any transgression of it should creep in through ignorance. For God also consecrated the Sabbath to Himself from the creation of the world, and desired it to be observed by the people before the promulgation of the Law; and yet afterwards the peculiar holiness of the day was more distinctly expressed. Besides, the clean animals are here distinguished from the unclean, by name as well as by signs. The proper names, which are recited, are of little service to us now-a-days; because many species which are common in the East, are unknown elsewhere; and it was therefore easy for Jews (35) who were born and had lived in distant countries, to fall into error about them; whilst, on the other hand, the more bold they are in their conjectures, the less are they to be trusted. As to many of them, I acknowledge that there is no ambiguity, especially as to the tame animals, or those that are to be found everywhere, or that have plain descriptions of them given in the Bible. A positive knowledge then is only to be sought from the signs which are here laid down; viz., that the animals which have cloven hoofs, and which ruminate, are clean: and that those are unclean in which either of these two things is wanting; that either sea or river fish, which have fins and scales, are clean. No such distinction as to birds is given, but only the unclean are named, which it was sinful to eat. Lastly, mention is made of reptiles. As to details, if there be anything worthy of observation, the place to consider them will be further on; let us now remember, in general, what I have before touched upon, viz., that whilst the Gentiles might eat every kind of food, many were forbidden to the Jews, in order that they might learn in their very food to cultivate purity; and this was the object of their separation from ordinary customs. Hence it arose that they use the word חלל, chalal (36) both for “to make common,” and to “contaminate;” and the word, חול,chol, signifies “polluted, ” because it is opposed to anything holy or set apart. It is true, indeed, that the Gentiles, by natural instinct, have regarded with the utmost horror the eating of some of the animals which are here forbidden; still, God would surround His people with barriers, which must separate them from their neighbors.

Those who imagine that God here had regard to their health, as if discharging the office of a Physician, pervert by their vain speculation the whole force and utility of this law. I allow, indeed, that the meats which God permits to be eaten are wholesome, and best adapted for food; but, both from the preface, — in which God admonished them that holiness was to be cultivated by the people whom He had chosen, — as also from the (subsequent) abolition of this law, it is sufficiently plain that this distinction of meats was a part of that elementary instruction (37) under which God kept His ancient people.

"Let no man therefore judge you (says Paul) in meat or in drink, which are a shadow of things to come; but the body is of Christ.” (Colossians 2:16.)

By which expressions he means, that what was spiritual had been shadowed forth in the external rite of abstaining from meats. To the same effect he elsewhere says, (Romans 14:14) that he knows and is persuaded, (38) that in the Lord Jesus Christ there is nothing unclean; viz., because Christ by his death has redeemed His people from slavish subjection. Hence it follows, that the prohibition of meats must be counted among the ceremonies, which were exercises in the worship of God. But here a question arises, how it is reconcilable that, even from the days of Noah, certain animals were unclean, and yet that all without exception were allowed to be eaten? I cannot agree with some in thinking that the distinction originally made by God grew obsolete by degrees; for God, in excepting the eating of blood only, makes a grant of whatsoever moves upon the earth as the food of the posterity of Noah. I therefore restrict to the sacrifices that uncleanness, with the knowledge of which the hearts of the Patriarchs were then inspired, nor do I doubt but that it was as lawful for Abraham, as well as for them, to eat swine’s flesh as the flesh of oxen. Afterwards, when God imposed the yoke of the Law to repress the licentiousness of the people, He somewhat curtailed this general permission, not because He repented of His liberality; but because it was useful to compel in this way to obedience these almost rude and uncivilized people. But, since before the Law the condition of the saints was the same as our own, it must be remembered, as I said before, that, agreeably to the dictates of nature, they spontaneously avoided certain foods, just as at present no one will hunt wolves or lions for food, nor desire to eat serpents and other venomous animals. But the object of this ordinance was different, viz., lest they who were God’s sacred and peculiar people, should freely and promiscuously communicate with the Gentiles.