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1. The Gemara explains how one is liable to bring a Korban according to Munbaz if he knew "when he sinned."
2. There is a dispute about what makes one liable to bring a Korban according to the Rabanan (Rebbi Akiva).
3. The Gemara explains how one can be liable to bring a Korban for every Melachah, according to Reish Lakish.
4. There is a dispute about what one should do if he forgets what day it is, while he is in the desert, and he has nobody to ask.
5. Rava: In the case above (#4), he is allowed to do Melachah only in order to have enough food in order to survive, not more.
A BIT MORE
1. Munbaz explains that one who unintentionally sins brings a Korban if he knew -- at the time that he sinned -- that if he sins intentionally he is liable to receive Kares.
2. Rebbi Yochanan: He forgot that a person is liable to receive Kares for such an act, even though he remembered that the act violates a negative prohibition. Reish Lakish: He forgot both that one transgresses a negative prohibition and that it is punishable with Kares.
3. It is possible to be liable to bring a Korban for every Melachah in the event that he knows about the prohibition of Techum, but does not know about the other Melachos. His knowledge of the concept of Techum indicates that he is aware of the concept of Shabbos.
4. Rav Huna: He should count every six days and observe the seventh as Shabbos. Chiya bar Rav: He should observe a the first day as Shabbos and then count six days.
5. This allowance to do Melachah applies on all seven days, since he must eat in order to survive. However, if he is aware, for example, that the day before he lost count was a weekday, then he may do Melachah on that day every week.
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