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1 Ye are the children of the LORD your God: ye shall not cut yourselves, nor make any baldness between your eyes for the dead. 2 for thou art an holy people unto the LORD thy God, and the LORD hath chosen thee to be a peculiar people unto himself, above all the nations that are upon the earth. 3 Thou shalt not eat any abominable thing. 4 These are the beasts which ye shall eat: the ox, the sheep, and the goat, 5 The hart, and the roebuck, and the fallow deer, and the wild goat, and the pygarg, and the wild ox, and the chamois. 6 And every beast that parteth the hoof, and cleaveth the cleft into two claws, and cheweth the cud among the beasts, that ye shall eat. 7 Nevertheless these ye shall not eat of them that chew the cud, or of them that divide the cloven hoof; as the camel, and the hare, and the coney: for they chew the cud, but divide not the hoof; therefore they are unclean unto you. 8 And the swine, because it divideth the hoof, yet cheweth not the cud, it is unclean unto you: ye shall not eat of their flesh, nor touch their dead carcase. 9 These ye shall eat of all that are in the waters: all that have fins and scales shall ye eat: 10 And whatsoever hath not fins and scales ye may not eat; it is unclean unto you. 11 Of all clean birds ye shall eat. 12 But these are they of which ye shall not eat: the eagle, and ossifrage, and the ospray, 13 And the glede, and the kite, and the vulture after his kind, 14 And every raven after his kind, 15 And the owl, and the night hawk, and the cuckow, and the hawk after his kind, 16 The little owl, and the great owl, and the swan, 17 And the pelican, and the gier eagle, and the cormorant, 18 And the stork, and the heron after her kind, and the lapwing, and the bat. 19 And every creeping thing that flieth is unclean unto you: they shall not be eaten. 20 But of all clean fowls ye may eat. 21 Ye shall not eat of any thing that dieth of itself: thou shalt give it unto the stranger that is in thy gates, that he may eat it; or thou mayest sell it unto an alien: for thou art an holy people unto the LORD thy God. Thou shalt not seethe a kid in his mother's milk. 22 Thou shalt truly tithe all the increase of thy seed, that the field bringeth forth year by year. 23 And thou shalt eat before the LORD thy God, in the place which he shall choose to place his name there, the tithe of thy corn, of thy wine, and of thine oil, and the firstlings of thy herds and of thy flocks; that thou mayest learn to fear the LORD thy God always. 24 And if the way be too long for thee, so that thou art not able to carry it; or if the place be too far from thee, which the LORD thy God shall choose to set his name there, when the LORD thy God hath blessed thee: 25 Then shalt thou turn it into money, and bind up the money in thine hand, and shalt go unto the place which the LORD thy God shall choose: 26 And thou shalt bestow that money for whatsoever thy soul lusteth after, for oxen, or for sheep, or for wine, or for strong drink, or for whatsoever thy soul desireth: and thou shalt eat there before the LORD thy God, and thou shalt rejoice, thou, and thine household, 27 And the Levite that is within thy gates; thou shalt not forsake him; for he hath no part nor inheritance with thee. 28 At the end of three years thou shalt bring forth all the tithe of thine increase the same year, and shalt lay it up within thy gates: 29 And the Levite, (because he hath no part nor inheritance with thee,) and the stranger, and the fatherless, and the widow, which are within thy gates, shall come, and shall eat and be satisfied; that the LORD thy God may bless thee in all the work of thine hand which thou doest.
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[AD 215] Clement of Alexandria on Deuteronomy 14:3
Among the Jews, frugality was made a matter of precept by a very wise dispensation of the law. The Educator forbade them the use of innumerable things. He explained the reasons, the spiritual ones hidden, the material ones obvious, but all of which they trusted. Some animals [were forbidden] because they were [not] cloven-footed; others, because they did not ruminate their food; a third class, because they, alone among all the fish of the seas, had no scales; until finally there were only a few things left fit for food. And even of those he permitted them to touch, he placed a prohibition on the ones found dead or offered to idols or strangled. They could not even touch them. He imposed upon them a contrary course of action until the inclination engendered by habits of easy living be broken, because it is difficult for one who indulges in pleasures to keep himself from returning to them.

Source: CHRIST THE EDUCATOR 2.1.17
[AD 1781] Richard Challoner on Deuteronomy 14:3
Unclean: See the annotations on Lev. 11.
[AD 397] Ambrose of Milan on Deuteronomy 14:4
And therefore the animals that are clean according to the law have horns, for the law is spiritual. Those who can repel the enticements of this world through the Word of God and the observance of virtue seem to be protected by horns upon their heads, so to speak, as if by weapons. And with good reason the wonderful power of discourse that incites the good soldiers of Christ to battle, so that we may carry back the spoils from our enemy the devil, is called a horn [trumpet]. Therefore we are in a battle, and we perceive that many of us are captives in the camp of our enemy. Them we must deliver from a very heavy yoke of slavery.

Source: THE PATRIARCHS 11.56