ויקרא, פרק י״א, פסוק כ״ז

The laws of purity and impurity extend beyond diet, reaching into the anatomy of the animal kingdom. A specific category of impure creatures is defined by the unique structure of their feet and the way they walk. The primary approach among commentators is that this refers to animals lacking hard hooves. Instead, they have separated toes and walk directly on the flesh of their feet, such as dogs, bears, cats, wolves, and foxes [רש״י, רשב״ם, שד״ל, מזרחי, רלב״ג, ביאור יש״ר]. Alternatively, some point out that the biblical term for paw is often associated with the human hand. In this view, the rule targets animals that use their feet like hands to grasp objects. This includes monkeys, squirrels, human-like apes, and even seals with webbed toes [מלבי״ם, תורה תמימה]. A middle ground suggests that while the monkey serves as a classic example of this grasping ability, the law clearly encompasses all animals that walk on soft paws [הופמן בשם הראב״ד].

The law specifies that these creatures must walk on all fours, a detail meant to refine the scope of the rule. This requirement specifically excludes pure birds, which have paws but walk on two legs, as well as humans and creeping insects [רלב״ג, ביאור יש״ר]. Conversely, another perspective views the mention of walking on four not as an exclusion, but as an expansion to include all impure wild beasts, even large animals like the elephant [תורה תמימה, מלבי״ם].

The declaration that these animals are impure sparks a discussion about the exact nature of the restriction. Because creatures like dogs and bears were not previously listed among the forbidden foods, simply because people do not typically eat them, some commentators explain that the rule serves to clarify that they are indeed forbidden for consumption [הטור הארוך בשם הרמב״ן, רלב״ג, ביאור יש״ר]. Others emphasize that the primary focus is strictly on the impurity transferred through physical contact [רש״י, ברכת אשר].

This impurity through touch applies equally to all Israelites, including men, women, and children [אבן עזרא]. Crucially, it only takes effect once the animal has died, rather than while it is still alive [ביאור יש״ר]. An earlier, mistaken belief that living animals could transfer this impurity was firmly rejected [הופמן בשם הראב״ע].

In practice, physical contact with the carcass renders a person impure until the evening. This form of impurity is considered lighter than the impurity transferred by carrying a carcass, because merely touching it does not cause the person's clothing to become impure [אדרת אליהו]. To contract this impurity, one must touch a piece of the carcass at least the size of an olive [רלב״ג]. Finally, a repetition in the broader laws of impurity teaches that these rules apply not only to a complete, intact carcass. The same impurity results from touching a single limb separated from a dead animal, or even a limb that was torn from the creature while it was still alive [מלבי״ם].