Reference for Pesachim 124:5

טעמא בזמנו הא שלא בזמנו כשר ואמאי נימא הואיל ובזמנו פוסל שלא בזמנו נמי פוסל

Thus the reason [that R'Eliezer disqualifies it] is that it i its own time, but [if it were slaughtered] at a different time<span class="x" onmousemove="('comment',' Lit., 'not in its time'.');">⁸</span> it is fit; yet why so? Let us say, Since he disqualifies [it]<span class="x" onmousemove="('comment',' This is the reading in cur. edd. Tosaf.'s reading is preferable: since it is disqualified, etc.');">⁹</span>

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