ויקרא, פרק י״א, פסוק ג׳

The intricate dietary laws outlined in the Torah serve as far more than a collection of technical rules. They are designed to shape the boundaries of holiness and purity for the Israelites, reflecting profound biological, legal, and spiritual principles that protect both body and soul. When identifying permissible animals, the first physical requirement focuses on the structure of the foot. The primary approach among commentators is that a pure animal must not have separate toes or claws like a dog or a cat; rather, its foot must be covered by a single, hard, shoe-like casing [רשב״ם, שד״ל, רלב״ג, ביאור יש״ר, רש״ר הירש, הכתב והקבלה, בכור שור]. Others suggest the description inherently implies a hoof that is cracked or divided [רש״י, מזרחי, שפתי חכמים, רד״צ הופמן]. However, simply possessing a hoof is not enough. Because some animals, like the camel, have hooves that are split at the top but fused at the bottom, and others, like the horse or donkey, have completely solid hooves, an additional condition is required. The hoof must be completely cleft, divided into two distinct parts from top to bottom [רש״י, רשב״ם, מזרחי, העמק דבר, גור אריה, אבן עזרא].

The second requirement is that the animal must chew its cud. Physiologically, this refers to animals with multi-chambered stomachs that swallow their food almost whole, only to bring it back up to the mouth to be thoroughly chewed and ground [רש״ר הירש, רד״צ הופמן, שטיינזלץ]. Commentators offer various explanations for the origins of the term used to describe this digestive process. Some suggest it derives from the word for "throat," as the food travels back up the animal's throat [אבן עזרא, חזקוני]. Others connect it to the concept of dragging or pulling, referring to how the animal draws the food back or grinds it with its teeth [רש״י, רש״ר הירש, רד״צ הופמן]. Additional interpretations relate the term to a flowing motion, as the food streams back to the mouth [רש״י, חזקוני], or to the idea of melting and softening the food [רש״י, נתינה לגר].

Both of these physical signs must be present simultaneously for an animal to be permissible for consumption [רמב״ן, רלב״ג]. Observing nature reveals a fascinating biological consistency regarding these traits: every animal with a split hoof also chews its cud, with the sole exception of the pig. Conversely, all animals that chew their cud possess split hooves, except for the camel, the hare, and the hyrax [אור החיים]. Building upon this natural rule, the sages established a practical method for identifying a pure animal in cases where its hooves have been severed. Because cud-chewing animals lack upper incisors, any animal missing its upper teeth—provided it can be identified as not being a young camel—is presumed to be pure [תורה תמימה, רש״ר הירש, רד״צ הופמן].

The scope of these dietary laws also extends to a fetus found inside its mother's womb. If a pure animal is properly slaughtered and a fetus is discovered within, the fetus is permissible to eat by virtue of its mother's slaughter. It is considered an extension of the mother and does not require its own independent slaughter [רש״י, מזרחי, שפתי חכמים, מלבי״ם, תולדות יצחק]. Furthermore, the specific directive outlining which animals are permissible serves to explicitly exclude the rest. This establishes that consuming an impure animal is not merely a failure to fulfill a positive Commandment, but an active violation of a negative Commandment that carries a punishment [רמב״ן, רש״י, תורה תמימה, מלבי״ם, אדרת אליהו, פרדס יוסף].

Various explanations are offered for this specific system of signs. From a physical and medical standpoint, it is suggested that impure animals are detrimental to human health, whereas the digestive process of chewing the cud renders the pure animal healthier and more appropriate for human consumption [רשב״ם, צרור המור]. Spiritually, the foods one consumes directly impact the purity of the soul, much like the prohibition against eating from the Tree of Knowledge was intended to protect the spiritual purity of the first human [צרור המור]. On a symbolic level, the split hoof represents the ability to tread within the material world while maintaining a necessary degree of separation from it, with the cleft allowing holiness to penetrate even mundane matters. Similarly, the act of chewing the cud symbolizes the need to reflect and carefully weigh one's actions before becoming entirely immersed in worldly affairs, while also hinting at the constant review and repetition required in Torah study [נחל קדומים, חומש קה״ת].