De agricultura 1:131 Do you not see that the law pronounces the camel to be an unclean beast, because it chews the cud and does not part the hoof. [Leviticus 11:4.] And yet, if we considered this sentence as it is expressed in its literal sense, I do not see what reason there is in it when it is interpreted; but if we look at it in its allegorical meaning, it is very clear and inevitable.
De agricultura 1:145 For he says that the swine is an unclean animal, because it divides the hoof and does not chew the cud, just as he has pronounced the camel unclean for the contrary reason because it chews the cud and does not divide the hoof. But as many animals as partake of both these qualities are very appropriately described as clean, because they have avoided impropriety in both the aforementioned particulars. For division without memory, and care, and a diligent examination of what is best, is but an imperfect good; but the combination and union of the two in the same animal is a most perfect good.
What Quadrupeds are clean
De specialibus legibus 4:105-131 105 The animals which are clean and lawful to be used as food are ten in number; the heifer, the lamb, the goat, the stag, the antelope, the buffalo, the roebuck, the pygarg, the wild-ox, and the chamois [Deuteronomy 14:4], for he always adheres to that arithmetical subtilty which, as he originally devised it with the minutest accuracy possible, he extends to all existing things, so that he establishes no ordinances, whether important or unimportant, without taking and as it were adapting this number to it as closely connected with the regulations which he is ordaining. Now of all the numbers beginning from the unit, the most perfect is the number ten, and as Moses says, it is the most sacred of all and a holy number, and by it he now limits the races of animals that are clean, wishing to assign the use of them to all those who partake of the constitution which he is establishing. 106 And he gives two tests and criteria of the ten animals thus enumerated [Leviticus 11:3] by two signs, first, that they must part the hoof, secondly, that they must chew the cud; for those which do neither, or only one of these things, are unclean. And these signs are both of them symbols of instruction and of the most scientific learning, by which the better is separated from the worse, so that all confusion between them is prevented; 107 for as the animal which chews the cud, while it is masticating its food draws it down its throat, and then by slow degrees kneads and softens it, and then after this process again sends it down into the belly, in the same manner the man who is being instructed, having received the doctrines and speculations of wisdom in at his ears from his instructor, derives a considerable amount of learning from him, but still is not able to hold it firmly and to embrace it all at once, until he has resolved over in his mind everything which he has heard by the continued exercise of his memory (and this exercise of memory is the cement which connects ideas), and then he impresses the image of it all firmly on his soul. 108 But as it seems the firm conception of such ideas is of no advantage to him unless he is able to discriminate between and to distinguish which of contrary things it is right to choose and which to avoid, of which the parting of the hoof is the symbol; since the course of life is twofold, the one road leading to wickedness and the other to virtue, and since we ought to renounce the one and never to forsake the other.
Avot 5:15 There are four traits among those who sit before the sages: `a sponge, a funnel, a strainer, and a sifter. `A sponge—because he sponges everything up; `a funnel—because he takes in on one side and lets out on the other; `a strainer—for he lets out the wine and keeps in the lees; `and a sifter—for he lets out the flour and keeps in the finest flour.
What animals are not clean
109 For this reason all animals with solid hoofs, and all with many toes are spoken of by implication as unclean; the one because, being so, they imply that the nature of good and evil is one and the same; which is just as if one were to say that the nature of a concave and a convex surface, or of a road up hill and down hill, was the same. And the other, because it shows that there are many roads, though, indeed, they have no right to be called roads at all, which lead the life of man to deceit; for it is not easy among a variety of paths to choose that which is the most desirable and the most excellent.
What Aquatic animals are Clean
110 Having laid down these definitions with respect to land animals, he proceeds to describe what aquatic creatures are clean and lawful to be used for food; distinguishing them also by two characteristics as having fins or scales. [Leviticus 11:9.] For those which have neither one nor the other, and those which have only one of the two, he rejects and prohibits. [Deuteronomy 14:10.] And he must state the cause, which is not destitute of sense and propriety; 111 for all those creatures which are destitute of both, or even of one of the two, are sucked down by the current, not being able to resist the force of the stream; but those which have both these characteristics can stem the water, and oppose it in front, and strive against it as against an adversary, and struggle with invincible good will and courage, so that if they are pushed they push in their turn; and if they are pursued they turn upon their foe and pursue it in their turn, making themselves broad roads in a pathless district, so as to have an easy passage to and fro. 112 Now both these things are symbols; the former of a soul devoted to pleasure, and the latter of one which loves perseverance and temperance. For the road which leads to pleasure is a down-hill one and very easy, being rather an absorbing gulf than a path. But the path which leads to temperance is up hill and laborious, but above all other roads advantageous. And the one leads men downwards, and prevents those who travel by it from retracing their steps until they have arrived at the very lowest bottom, but the other leads to heaven; making those who do not weary before they reach it immortal, if they are only able to endure its rugged and difficult ascent.
113 And adhering to the same general idea the lawgiver asserts that those reptiles which have no feet, and which crawl onwards, dragging themselves along the ground on their bellies, or those which have four legs, or many feet, are all unclean as far as regards their being eaten. And here, again, when he mentions reptiles he intimates under a figurative form of expression those who are devoted to their bellies, gorging themselves like cormorants, and who are continually offering up tribute to their miserable belly, tribute, that is, of strong wine, and confections, and fish, and, in short, all the superfluous delicacies which the skill and labor of bakers and confectioners are able to devise, inventing all sorts of rare viands, to stimulate and set on fire the insatiable and unappeasable appetites of man. And when he speaks of animals with four legs and many feet, he intends to designate the miserable slaves not of one single passion, appetite, but of all the passions; the genera of which are four in number; but in their subordinate species they are innumerable. Therefore, the despotism of one is very grievous, but that of many is most terrible, and as it seems intolerable. 114 Again, in the case of those reptiles who have legs above their feet, so that they are able to take leaps from the ground, those Moses speaks of as clean; as, for instance, the different kinds of locusts, and that animal called the serpent-fighter, here again intimating by figurative expressions the manners and habits of the rational soul. For the weight of the body being naturally heavy, drags down with it those who are but of small wisdom, strangling it and pressing it down by the weight of the flesh. 115 But blessed are they to whose lot it has fallen, inasmuch as they have been well and solidly instructed in the rules of sound education, to resist successfully the power of mere strength, so as to be able, by reason of what they have learnt, to spring up from the earth and all low things, to the air and the periodical revolutions of the heaven, the very sight of which is to be admired and earnestly striven for by those who come to it of their own accord with no indolence or indifference.
116 Having, therefore, in his ordinances already gone through all the different kinds of land animals and of those who live in the water, and having distinguished them in his code of laws as accurately as it was possible, Moses begins to investigate the remaining class of animals in the air; the innumerable kinds of flying creatures, rejecting all those which prey upon one another or upon man, all carnivorous birds, in short, all animals which are venomous, and all which have any power of plotting against others. 117 But doves, and pigeons, and turtle-doves, and all the flocks of cranes, and geese, and birds of that kind, he numbers in the class of domestic, and tame, and eatable creatures, allowing everyone who chooses to partake of them with impunity. 118 Thus, in each of the parts of the universe, earth, water, and air, he refuses some kinds of each description of animal, whether terrestrial, or aquatic, or aerial, to our use; and thus, taking as it were fuel from the fire, he causes the extinction of appetite.
Carcasses and Bodies which have been torn
119 Moreover, Moses commands [Leviticus 5:2] that no man shall take of any dead carcass, or of any body which has been torn by wild beasts; partly because it is not fitting that man should share a feast with untameable beasts, so as to become almost a fellow reveller in their carnivorous festivals; and partly because perhaps it is injurious and likely to cause disease if the juice of the dead body becomes mingled with the blood, and perhaps, also, because it is proper to preserve that which has been pre-occupied and seized beforehand by death untouched, having a respect to the necessities of nature by which it has been seized. 120 Now many of the lawgivers both among the Greeks and barbarians, praise those who are skillful in hunting, and who seldom fail in their pursuit or miss their aim, and who pride themselves on their successful hunts, especially when they divide the limbs of the animals which they have caught with the huntsmen and the hounds, as being not only brave hunters but men of very sociable dispositions. But anyone who was a sound interpreter of the sacred constitution and code of laws would very naturally blame them, since the lawgiver of that code has expressly forbidden any enjoyment of carcasses or of bodies torn by beasts for the reasons before mentioned. 121 But if any one of those persons who devote themselves wholly to meditations on and to the practice of virtue were suddenly to become fond of gymnastic exercises and of hunting, looking upon hunting as a sort of prelude to and representation of the wars and dangers that have to be encountered against the enemy, then, whenever such a man is successful in his sport, he ought to give the beasts which he has slain to his dogs as a feast for them, and as a reward or wages for their successful boldness and their irreproachable alliance. But he ought not himself to touch them, inasmuch as he has been previously taught in the case of irrational animals, what sentiments he ought to entertain, respecting his enemies. For he ought to carry on war against them, not for the sake of unrighteous gain like those who make a dishonest traffic of all their actions, but either in revenge for some calamities which he has previously suffered at their hands, or with a view toward some which he expects to suffer. 122 But some men, with open mouths, carry even the excessive luxury and boundless intemperance of Sardanapalus to such an indefinite and unlimited extent, being wholly absorbed in the invention of senseless pleasures, that they prepare sacrifices which ought never be offered, strangling their victims, and stifling the essence of life [Leviticus 17:11], which they ought to let depart free and unrestrained, burying the blood, as it were, in the body. For it ought to have been sufficient for them to enjoy the flesh by itself, without touching any of those parts which have a connection with the soul or life. 123 On which account Moses, in another passage, establishes a law concerning blood, that one may not eat the blood nor the fat. [Leviticus 3:17.] The blood, for the reason which I have already mentioned, that it is the essence of the life; not of the mental and rational life, but of that which exists in accordance with the outward senses, to which it is owing that both we and irrational animals also have a common existence. I. For the essence of the soul of man is the breath of God, especially if we follow the account of Moses, who, in his history of the creation of the world, says that God breathed into the first man, the founder of our race, the breath of life; breathing it into the principal part of his body, namely the face, where the outward senses are established, the body-guards of the mind, as if it were the great king. And that which was thus breathed into his face was manifestly the breath of the air, or whatever else there may be which is even more excellent than the breath of the air, as being a ray emitted from the blessed and thrice-happy nature of God. 124 But Moses commanded men to abstain from eating fat, because it is gross. And again, he gave us this injunction, in order to inculcate temperance and a zeal for an austere life: for some things we easily abandon, and without any hesitation; though we do not willingly encounter any anxieties or labors for the sake of the acquisition of virtue. 125 For which reason these two parts are to be taken out of every victim and burnt with fire, as a kind of first fruits, namely, the fat and the blood; the one being poured upon the altar as a libation; and the other as a fuel to the flame, being applied instead of oil, by reason of its fatness, to the consecrated and holy flame. 126 The lawgiver blames some persons of his time as gluttons, and as believing that the mere indulgence of luxury is the happiest of all possible conditions, not being content to live in this manner only in cities in which there were abundant supplies and stores of all kinds of necessary things, but carrying their effeminacy even into pathless and untrodden deserts, and choosing in them also to have markets for fish and meat, and all things which can contribute to an easy life: 127 then, when a scarcity arose, they assembled together and raised an outcry, and looked miserable, and with shameless audacity impeached their ruler, and did not desist from creating disturbances till they obtained what they desired; and they obtained it to their destruction, for two reasons: first of all, that it might be shown that all things are possible to God, who can find a way in the most difficult and apparently hopeless circumstances; and secondly, that punishment might fall on those who were intemperate in their gluttonous appetites, and obstinate resisters of holiness. 128 For a vast cloud being raised [Exodus 16:13] out of the sea showered down quails about the time of sunrise, and the camp and all the district around it for a day’s journey for a well-girt active man was overshadowed all about with the birds. [Numbers 11:31.] And the height of the flight of the birds was distant from the ground a height of about two cubits, in order that they might be easily caught. 129 It would have been natural therefore for them, being amazed at the marvellous nature of the prodigy which they beheld, to be satisfied with the sight, and being filled with piety to nourish their souls on that, and to abstain from eating flesh; but these men, on the contrary, stirred up their desires even more than before, and pursued these birds as the greatest good imaginable, and catching hold of them with both their hands filled their bosoms; then, having stored them up in their tents, they sallied forth to catch others, for immoderate covetousness has no limit. And when they had collected every description of food they devoured it insatiably, being about, vain-minded generation that they were, to perish by their own fullness; 130 and indeed at no distant time they did perish by the purging of their bile [Numbers 11:20], so that the place itself derived its name from the calamity which fell upon them, for it was called the graves of their lust [Numbers 11:34], than which there is not in the soul, as the scripture teaches us, any greater evil. 131 For which reason Moses says with great beauty in his recommendations, “Let not every man do that which seemeth good to his own eyes [Deuteronomy 11:8],” which is equivalent to saying, let not any one gratify his own desire, but let each person seek to please God, and the world, and nature, and wise men, repudiating self-love, if he would become a good and virtuous man.