Reference for Zevachim 169:12

סיפא אתאן לכשרה ומאי קמשמע לן דיש הפשט ונתוח בראש המזבח

Surely the Divine Law said: And he shall cut it into pieces,<span class="x" onmousemove="('comment',' Lev. I, 6.');">¹⁰</span> 'it' [implies] a fit; but not an unfit [animal]? - The final clause refers to a fit [sacrifice]; and w does he [the Tanna] inform us?<span class="x" onmousemove="('comment',' If it is fit, it obviously descends, since it will be taken up again.');">¹¹</span>

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