כדרבי אושעיא דאמר רבי אושעיא הפריש שתי חטאות לאחריות מתכפר באחת מהן ושניה תרעה
The Gemara answers: Even according to Rabbi Yehuda HaNasi there is a case in which a sin-offering is left to graze, in accordance with the opinion of Rabbi Oshaya, as Rabbi Oshaya said: If one separated two sin-offerings from the outset as a guarantee, so that if one is lost he may gain atonement with the other, he gains atonement with one of them and the second is left to graze.
והא אילו בפסח כי האי גוונא קרב שלמים אלא שמואל כרבי שמעון סבירא ליה דאמר חמש חטאות מתות
The Gemara challenges this: But with regard to a Paschal lamb, in a case like this the second animal would be sacrificed as a peace-offering. This, too, does not follow Shmuel’s principle. Rather, it can be explained that Shmuel held in accordance with the opinion of Rabbi Shimon, who said there are five sin-offerings that are left in isolation to die, including all those which are lost or deferred.
והא רועה לרבי שמעון לית ליה כלל שמואל נמי חדא קאמר כל שבחטאת מתה בפסח קרב שלמים
The Gemara asks: But Rabbi Shimon does not concede in any case at all that a sin-offering is left to graze, as he holds that any sin-offering which is deferred for any reason is left to die, while Shmuel referred to sin-offerings left to graze. The Gemara answers: Shmuel also said only one case. He did not mention sin-offerings that are left to graze; he said only that with regard to any offering that became unfit such that a sin-offering in its condition would be left to die, if it is a Paschal lamb in that condition it is sacrificed as a peace-offering.
ומאי קא משמע לן לאפוקי מדרבי יוחנן דאמר אין הפסח קרב שלמים אלא שנמצא אחר שחיטה אבל קודם שחיטה לא אלמא שחיטה קבע קא משמע לן חצות קבע
The Gemara asks: And what does he teach us with this statement beyond what was taught explicitly in the mishna? The Gemara answers that Shmuel’s statement was meant to exclude the opinion of Rabbi Yoḥanan, who said that a Paschal lamb is sacrificed as a peace-offering only when it is found after slaughter, but if it is found before the slaughter, no, it is not sacrificed as a peace-offering. Apparently, Rabbi Yoḥanan held that the slaughter determines when a sacrifice is deferred; therefore, Shmuel teaches us that in his opinion midday determines whether it is considered deferred, even if the other animal has not yet been slaughtered, because midday is the time when it may be slaughtered. Consequently, if the Paschal lamb is still lost at midday, it may be offered as a peace-offering when it is found.
לישנא אחרינא ואילו בפסח היכא דאבד ונמצא אחר חצות קודם שחיטה יקרב שלמים שמואל כרבה סבירא ליה דאמר שחיטה קבע
The Gemara presents another version of the discussion, beginning from the proof that the halakhot of a sin-offering cannot be equated to those of a Paschal lamb because with regard to a Paschal lamb, in a situation where it is lost and then found after midday but before the slaughter of its replacement, it is offered as a peace-offering, which is not consistent with Shmuel’s principle. The Gemara answers: According to this version, Shmuel holds in accordance with the opinion of Rabba, who said that the slaughter of the replacement determines the status of a lost offering; therefore, if the original animal is found before the slaughter of the second animal, even after midday, it is not considered to have been lost.
והא מדקאמר רבי יוחנן עלה אין הפסח קרב שלמים אלא שנמצא אחר שחיטה אבל קודם שחיטה לא אלמא שחיטה קבע מכלל דשמואל סבר חצות קבע
The Gemara asks: But from the fact that Rabbi Yoḥanan said about this halakha that a Paschal lamb is sacrificed as a peace-offering only when it was found after the slaughter of the replacement, but if it was found before the slaughter, no, it is not, apparently he held that the slaughter determines whether the offering is considered lost. Since there is a dispute about this point, this proves by inference that Shmuel holds that midday determines this status, so that any animal lost at midday is considered lost and is sacrificed as a peace-offering, even if it is found before the slaughter. That does not accord with this second version of Shmuel’s opinion.
אלא שמואל כרבי סבירא ליה דאמר אבודה למיתה אזלא והא כל אבודין לרבי מתין ואילו בפסח היכא דאבד קודם חצות ונמצא קודם חצות רועה קסבר קודם חצות לאו אבוד הוא וקסבר חצות קבע:
Rather, Shmuel’s statement must be explained differently: Shmuel holds in accordance with the opinion of Rabbi Yehuda HaNasi, who said that a lost sin-offering always goes to its death. The Gemara asks: But according to Rabbi Yehuda HaNasi all lost sin-offerings are left in isolation to die, whereas with regard to the Paschal lamb, in a situation where it is lost before midday and found before midday it is left to graze and is not sacrificed as a peace-offering. The Gemara answers: He held that a Paschal lamb that is lost before midday is not considered lost because the time for slaughtering the Paschal lamb has not yet arrived, and he held that midday determines the status of a lost Paschal lamb, not the time of the actual slaughter.
מתני׳ המפריש נקבה לפסחו או זכר בן שתי שנים ירעה עד שיסתאב וימכר ויפלו דמיו לנדבה לשלמים
MISHNA: In the case of one who separates a female animal for his Paschal lamb although the Torah requires a male, or a male that is in its second year although a Paschal lamb must be an animal that is in its first year, the animal is left to graze until it develops a blemish and becomes unfit, and it is then sold and its money is used for free-will offerings or peace-offerings.