Reference for Bava Kamma 50:10

ואכתי מופנה מצד אחד הוא הניחא למ"ד מופנה מצד אחד למידין ואין משיבין שפיר אלא למ"ד למידין ומשיבין מאי איכא למימר

Why then had the Divine Law to mention again <i>raiment or skin</i> in the case of dead reptiles?<span class="x" onmousemove="('comment',' Lev. XI, 32. ');">²⁵</span> It may thus be concluded that it was [inserted] to be 'free' [for exegetical purposes].<span class="x" onmousemove="('comment',' Thus to make the Gezerah shawah irrefutable. ');">²⁶</span> Still it has so far only been proved that one part [of the <i>Gezerah shawah</i>]<span class="x" onmousemove="('comment',' I.e., in the case of dead reptiles. ');">²⁷</span>

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