Reference for Bava Kamma 50:7
מופנה דאי לא מופנה איכא למפרך מה לשרץ שכן מטמא בכעדשה תאמר במת שאין מטמא בכעדשה אלא בכזית
while in the case of a corpse it is also stated, <i>raiment … skin</i>:<span class="x" onmousemove="('comment',' Num. XXXI, 20: And as to every raiment and all that is made of skin … ye shall purify. ');"><sup>18</sup></span> just as in the case of <i>raiment or skin</i> stated in connection with dead reptiles,<span class="x" onmousemove="('comment',' Lev. XI, 32: … whether it be any vessel of wood or raiment or skin … it shall be unclean until the even. ');"><sup>15</sup></span> mats [are included to] become defiled, so is it regarding <i>raiment … skin</i> stated in connection with a corpse<span class="x" onmousemove="('comment',' Num. XXXI, 20: And as to every raiment and all that is made of skin … ye shall purify. ');"><sup>18</sup></span>