Reference for Shabbat 127:19

דמת נמי אפנויי מופנה מכדי מת אתקש לשכבת זרע דכתיב (ויקרא כב, ד) והנוגע בכל טמא נפש או איש אשר תצא ממנו שכבת זרע וכתיב בשכבת זרע וכל בגד וכל עור בגד ועור דכתב רחמנא במת למה לי ש"מ לאפנויי:

just as the 'raiment and skin' which are mentioned in connection with reptiles, it [Scripture] declares unclean only that which is spun and woven, so the 'raiment and skin' which are stated in connection with the dead, it declares unclean only that which is spun and woven;<span class="x" onmousemove="('comment',' Though an analogy between the two cannot be drawn, as shown, because the uncleanness of one is graver than that of the other, yet one can deduce equality of law through the gezerah shawah. ');">¹⁸</span>

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