Reference for Pesachim 120:13

ואמר לי לא אם אמרת בשינוי קודש שכן פסולו בגופו וישנו בארבע עבודות

As for there, it is well: there, as long as does not [expressly] overthrow it at the slaughtering, its tacit [destiny] is certainly to be killed for its own purpose. But here, does it tacitly stand for those who are [registered] to eat it? Perhaps these will withdraw and others will come and register for it, for we learned: They may register and withdraw their hands from it [the Paschal lamb] until he kills it. The scholars asked: What is the law of a Paschal lamb which was slaughtered during the rest of the year with a change of its offering, which may then not be eaten, or in part, in the sense that they may be eaten, but their owners have not discharged their obligations and must bring another. Therefore it is logical that its disqualifying power should be so strong as to render of no avail the fact that it was slaughtered for its purpose too. owners?<span class="x" onmousemove="('comment',' The animal was set aside for a certain person and then slaughtered for a different person, but for its own purpose (Rashi) .');">¹⁵</span> Is a change of owner like a change of sanctity,<span class="x" onmousemove="('comment',' I.e., like slaughtering it as a different sacrifice.');">¹⁶</span> and it validates it; or not? - Said R'Papa. I stated this argument before Raba: Since a change of sanctity disqualifies it at its own time, and a change of owner disqualifies it at its own time: then just as a change of sanctity, which disqualifies it at its own time, validates it at a different time,<span class="x" onmousemove="('comment',' The text must be emended thus.');">¹⁷</span> so a change of owner, which disqualifies it at its own time, validates it at a different time. But he said to me, It is not so: If you say thus in the case of a change of sanctity, [that is] because its disqualification is intrinsic,<span class="x" onmousemove="('comment',' I.e., an illegitimate intention is expressed in respect to the sacrifice itself.');">¹⁸</span> and it is [operative] in respect of the four services,<span class="x" onmousemove="('comment',' V. Mishnah supra ');">¹⁹</span>

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