The Mishnah presents a case where an individual is obligated to bring a sin-offering due to a doubt, known as a Hashem Talui. This refers to a situation where one is uncertain if they committed a sin, and only God knows the truth. The ruling is that if the Day of Atonement, Yom Kippur, passes while one is in this state of doubt, they are absolved of the obligation to bring a Hashem Talui. This is derived from the verse, "From all your sins before God," which implies that Yom Kippur atones for sins known only to God. These are precisely the sins categorized as a Hashem Talui, where human knowledge is absent, and only the Omnipresent knows whether the transgression occurred.
Rabbi Tachlifa taught in the name of Ravina that this derivation from the verse, "From all your sins before God," teaches two things. Firstly, it establishes that Yom Kippur atones for sins known only to God. Conversely, for sins where the individual is certain they transgressed, Yom Kippur does not atone. This single derivation, therefore, suffices to establish both aspects of the law, rendering other similar derivations unnecessary.
Rabbi Tachlifa further stated in the name of Ravina that if someone was obligated to receive lashes (Malkut) for a transgression, and Yom Kippur passed, they are still obligated to receive the lashes. Yom Kippur does not atone for this obligation. This raises a question: why should Malkut be different from a definite sin-offering (Hatat Vadai) or a definite guilt-offering (Asham Vadai), for which Yom Kippur does not atone? One might argue that Yom Kippur does not atone for monetary obligations, but Malkut is a physical punishment. Perhaps the suffering of Yom Kippur itself could atone for the lashes. However, the ruling is that even for Malkut, Yom Kippur does not atone. This seems to contradict the teaching in Massechet Shavuot, which states that Yom Kippur atones for all transgressions, whether positive or negative commandments, known or unknown, including those for which one is liable for Malkut. The resolution is simple: Yom Kippur atones for negative commandments that were transgressed without a warning (and thus no liability for Malkut). However, if there was a warning, and one became liable for Malkut, Yom Kippur does not atone.
The Gemara then challenges Rabbi Elazar's rule that Yom Kippur atones only for sins known to God, posing five questions. The first question concerns a woman in a state of doubtful childbirth (Sefek Yoledet). If she gave birth to a viable child, she must bring a sin-offering to purify herself and partake in sacred food. If she did not, she is not obligated. Since only God knows if she gave birth, according to Rabbi Elazar, Yom Kippur should atone for her, and she should not have to bring a sin-offering. Yet, the law states she must bring it. Rabbi Shimon ben Yochai explains that a woman in childbirth is considered a sinner because she vows during her pain not to approach her husband again, a vow she inevitably breaks. Thus, she needs atonement. However, the primary purpose of her offering is not for this sin, but to permit her to eat sacred food. The atonement for the vow is achieved through the pain of childbirth itself.
The second question involves a person with doubtful leprosy (Safek Metzora). If a leprous spot appears first, followed by two hairs, the person is ritually impure. If the hairs appear first, followed by the spot, they are pure. If the order is unknown, it's a doubt. According to Rabbi Elazar, if Yom Kippur passes, it should atone, and no offering should be required, as only God knows the sequence. However, the law states that a Metzora must bring an offering. Rabbi Oshaya clarifies that the offering is for ritual impurity, not a sin. The Gemara counters by citing Rabbi Shimon ben Nachmani in the name of Rabbi Yonatan, who lists seven sins for which leprosy comes upon a person. This implies leprosy is a consequence of sin. The resolution is similar: the offering's main purpose is to allow the person to eat sacred food, not primarily for atonement for the sin itself. The suffering of leprosy provides the atonement for the sin.
The third question relates to a doubtful Nazirite (Safek Nazir). This refers to a Nazirite who is uncertain if they became ritually impure during their period of Naziriteship. If only God knows, then according to Rabbi Elazar, Yom Kippur should atone, and no offering should be required. Yet, the law dictates that such a Nazirite must bring an offering. The Gemara suggests a different case: a Nazirite who declares, "I will be a Nazirite if my wife gives birth to a viable child," and then the gender is unknown. In such a case, he can bring an unconditional offering, stating, "If I am not a Nazirite, I will now become one; if I am, this is my offering." However, in the case of a Nazirite who is already a Nazirite and is unsure if he became impure, the offering is required. The Gemara asks why a Nazirite needs an offering at all, as Naziriteship is not a sin. The Gemara responds that it is a sin to abstain from wine. However, the offering is not for this sin, but to enable the Nazirite to become ritually pure and begin a new period of Naziriteship. The atonement for abstaining from wine comes from the abstinence itself.
The fourth question concerns a Sotah (a woman suspected of adultery). Since only God knows what happened in the private room, according to Rabbi Elazar, Yom Kippur should atone for her, and she should not have to bring the meal-offering of the Sotah. However, she must bring it. Rabbi Oshaya explains that the offering is to ascertain whether she became ritually impure, not for atonement. Abaye offers a different answer: it's not a sin known only to God because the man involved also knows. A third answer is that the offering is for discernment, to determine if she committed the sin, not for atonement.
The fifth question relates to the Eglah Arufah (beheaded calf ritual). If a dead body is found between two cities and the killer is unknown, the elders of the nearest city perform the Eglah Arufah ritual. Since only God knows who the killer is, Yom Kippur should atone, and the ritual should not be necessary. However, the ritual is performed. The Gemara responds that the killer himself knows, so it's not a sin known only to God. Furthermore, murder is an exceptional sin for which even Yom Kippur cannot atone, and the land cannot be appeased until the Eglah Arufah is performed. The verse mentions atonement for the people of Israel, specifically those "you redeemed from Egypt." This implies that the Eglah Arufah of the present generation can atone for unresolved murders from previous generations, even those from the time of the Exodus. This demonstrates that Yom Kippur is not always sufficient for atonement, and that the actions of later generations can influence the spiritual state of those who have passed.
The Gemara then revisits the original premise: if a sin is known only to God, Yom Kippur atones. What if one discovers their sin after Yom Kippur has passed? Does Yom Kippur still atone, or must they bring a sin-offering? We know from the Mishnah that if one discovers their sin after Yom Kippur, they must bring a sin-offering. Rabbi Zayida explains this is derived from the extra mention of "knowledge" (Yediah) in the Torah regarding the sin-offerings of an individual (Yahid), a leader (Nasi), and the community (Sibur). The Torah states that knowledge of the sin is required to bring a sin-offering, which is a leniency. The Gemara initially argues that all three mentions are necessary because each case has unique characteristics, preventing one from being derived from the others. For example, an individual brings a female animal, which is considered a leniency. A leader's sin might not apply to an individual, such as testifying falsely in court. The community's sin requires both a faulty ruling by the court and subsequent action based on that ruling. Thus, each case needs its own mention of knowledge.
However, the Gemara ultimately concludes that the mention of "knowledge" for the Nasi is indeed superfluous. It could have been derived from the cases of the Yahid and the Sibur. The fact that it is explicitly written teaches that even if the knowledge of the sin comes after Yom Kippur, one is still obligated to bring a sin-offering. This is because the Nasi is unique in that he can change his status and revert to being an ordinary individual, which distinguishes his case from the others. Abaye offers a different approach, deriving the necessity of knowledge for all three cases from a verbal analogy (Gezeirah Shavah) between the term "commandments" (Mitzvot) used in all three contexts. The extra mention of "knowledge" then specifically teaches that even if knowledge of the sin comes after Yom Kippur, the offering is still required.
The Gemara then asks: if Yom Kippur does not atone for a definite sin that is known, but does atone for a Hashem Talui (a doubtful sin), then if one was in a state of Hashem Talui and Yom Kippur passed, should they still be obligated to bring a sin-offering if they later discover they definitely sinned? Perhaps Yom Kippur already atoned for the doubt. The Gemara responds that even in the case of a Hashem Talui, if one later discovers they sinned, they must bring a definite sin-offering. This is because the purpose of the Hashem Talui offering is to suspend divine punishment. Rabbi Zeira states that such a person "dies without sin," meaning they are protected from untimely death due to the sin, but the sin itself still requires atonement if it becomes known.
Returning to the Mishnah's case of the doubtful sin-offering of a bird, where the doubt was resolved after the offering's neck was pinched (Melikah), the Mishnah states that the bird should be returned to the coop. The Gemara seeks to understand what kind of resolution led to this outcome. If the doubt was resolved to confirm a birth, the bird should be eaten by the priests, as it is a valid sin-offering. If it was resolved that there was no birth, the bird should be permitted for ordinary use. The Mishnah's instruction to return it to the coop implies it's neither. Rav explains that if the doubt was resolved to confirm a birth, the bird is indeed a valid sin-offering and atones, but it should not be eaten because it might not have been guarded with the strictness required for sacred food during the period of doubt. The Gemara challenges this, arguing that a live bird cannot become ritually impure, and after Melikah, it would certainly be guarded. Therefore, the lack of guarding is not a valid reason.
The Gemara deduces that the Mishnah must be referring to a case where the doubt was resolved to confirm no birth. In such a situation, the bird should be permitted for ordinary use. However, the Sages decreed that it should be buried (or returned to the coop) so that people do not mistakenly believe that a sin-offering can be brought for a mere doubt. This is a rabbinic enactment to prevent error. Rav's statement that the offering "atones" must refer to a different scenario: if a woman brought a doubtful sin-offering, and before the Melikah, she realized she definitely gave birth, then the offering is valid and atones, because the same bird is used for both doubtful and definite sin-offerings. Rav further states that even if the blood was already sprinkled, and then she realized she definitely gave birth, the offering is valid and can be eaten by the priests. However, Rabbi Yochanan disagrees, ruling that in such a case, the bird should be forbidden from any use and buried. This is a rabbinic decree to prevent people from thinking that a doubtful offering, once processed, can be treated as a definite one, even if the truth is later discovered. The Gemara then brings a Baraisa that supports Rabbi Yochanan's view, detailing various scenarios for a doubtful bird offering and their respective outcomes, consistently emphasizing the need to prevent public misunderstanding regarding the validity of offerings brought under conditions of doubt.