Si hay una alimaña en la boca de una comadreja o un cadáver de animal en la boca de un perro, y pasan entre cosas puras, o cosas puras pasadas entre ellos, su incertidumbre es pura [es decir, su estado de pureza es incierto, y por lo tanto puro], porque la impureza no tiene lugar [fijo]. Si ellos [el perro o la comadreja] los pellizcaban [a los animales muertos] en el suelo, y alguien dice: "Fui a ese lugar, pero no sé si toqué [alimañas o el cadáver] o lo hice no tocarlo, su incertidumbre es impura [es decir, su estado de pureza es incierto y, por lo tanto, impuro], porque la impureza tiene un lugar [fijo].
Bartenura on Mishnah Tahorot
היו מנקרין בהן – if the weasel cast off the creeping animal or the dog [cast off] the carrion that is in their mouths onto the ground and they would peck at it, there is a place for the defilement and its manner of doubt is ritually impure.
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English Explanation of Mishnah Tahorot
Introduction
This mishnah is based on the distinction that we have seen several times already if the source of impurity was moving, and we are not sure if it defiled someone or something, the doubt remains pure. But if the source of impurity was considered to be stationary, the doubt is impure.
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English Explanation of Mishnah Tahorot
A weasel that had in its mouth a [dead] sheretz or a dog that had carrion in its mouth and they passed between clean [persons] or if clean persons passed between them, their condition of doubt is deemed clean, since the uncleanness , had no resting place. A dead sheretz and carrion both defile. But since they were moving by being held by the weasel or dog, the people among whom these things moved are clean.
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English Explanation of Mishnah Tahorot
If they were picking at them while these lay on the ground, and a person stated, "I went to that place but I do not know whether I did or did not touch it," his condition of doubt is deemed unclean, since the uncleanness had a resting place. In case two, the dog or weasel are picking at the sheretz or carrion and dragging them on the ground. Despite the fact that the sources of defilement are indeed moving, the mishnah considers anything on the ground to be stationary. Therefore, they do defile the people who might have walked among them.
