Reference for Pesachim 146:1
ותני עלה בחול כי האי גונא ישרף מיד אי אמרת בשלמא בעי עקירה האי פסח הוא וכיון דלית ליה בעלים הוה ליה פסולו בגופו אמטו להכי ישרף מיד
<br> Now it ways taught thereon: During the week in such circumstances it must be burnt immediately. Now it is well if you say that it requires abrogation: this is a Passover, and since it has no owners, its disqualification is in itself, [and] for that reason it must be burnt immediately. But if you say that it does not require abrogation [then] from the beginning it is a peace-offering; On account of what [then] is its disqualification? [Presumably] on account of something extraneous, viz., that he slaughtered it after the evening tamid! [But] then it requires disfigurement? For it was taught, This is the general rule: Wherever its disqualification is in itself, it must be burnt immediately; [if it is] in the blood or in its owner, [the flesh] must become disfigured and [then] it goes out to the place of burning - Rather, do not say, 'if he slaughtered it without specifying its purpose, it is fit as a burnt-offering,' but say, If he slaughtered it for the purpose of a burnt-offering, it is fit. This proves that it requires [express] abrogation.