Commentary for Chullin 142:9
כלום עושה עיכול למטה אלא על ידי מעלה
If in the case of man, who is capable of conveying uncleanness whilst alive, the fact that it is swallowed prevents [the unclean matter from conveying uncleanness], how much more so is it in the case of animals, which are incapable of conveying uncleanness whilst alive, that the fact that it is swallowed prevents [the unclean matter within from conveying uncleanness]! But perhaps that is so only with regard to man since he must tarry a prescribed period in a house stricken with leprosy;<span class="x" onmousemove="('comment',' In order that the clothes that he is wearing be also rendered unclean. This rule is derived from the fact that Lev. XIV, 46 states: He that goeth into the house . . shall be unclean until the even, whereas the next verse (Lev. XIV, 47) states: And he that lieth in the 'house shall wash his clothes; and he that eateth in the house shall wash his clothes. This presupposes that a longer stay in the house renders also the clothes worn by the person unclean. Since therefore the law of uncleanness in this respect with regard to man is not so severe, one would reasonably suppose that uncleanness emanating from a swallowed unclean object would not affect man.');"><sup>6</sup></span>
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