Reference for Chullin 132:5

מכדי אקשקשת קא סמכינן ליכתוב רחמנא קשקשת ולא ליכתוב סנפיר

But consider, we rely upon scales, the Divine Law then should have stated scales only [as the distinguishing mark] and not fins! - Had the Divine Law only stated scales and not fins I might have said that the word for scales [Kaskasim]<span class="x" onmousemove="('comment',' Heb. .');">²</span>

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