Commentary for Bava Kamma 50:8

לאיי אפנויי מופנה מכדי שרץ אתקש לשכבת זרע דכתיב (ויקרא כב, ד) או איש אשר תצא וגו' וסמיך ליה או איש אשר יגע בכל שרץ וכתיב ביה בשכבת זרע (ויקרא טו, יז) וכל בגד וכל עור אשר יהיה עליו שכבת זרע

that mats similarly become defiled. This <i>Gezerah shawah</i><span class="x" onmousemove="('comment',' The technical term for (an inference from) a verbal congruity in two different portions of the Law; v. Glos. ');">¹⁹</span> must necessarily be 'free',<span class="x" onmousemove="('comment',' Heb. vbpun (Mufnah), 'free', that is, for exegetical use, having no other purpose to serve, but solely intended to indicate this particular similarity in law. ');">²⁰</span> for if it were not 'free' the comparison made could be thus upset: seeing that in the case of dead reptiles [causing defilement to mats], their minimum for causing uncleanness is the size of a lentil,<span class="x" onmousemove="('comment',' Hag. 11a; Naz. 52a. ');">²¹</span>

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