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1. When a person in Pumbedisa declared all of his possessions to be Cherem, Rav Yehudah told him to redeem them (i.e. their holiness) with four Zuz, and to throw the four Zuz into the river.
2. The Gemara lists many laws that apply only when Yovel applies.
3. It is a Mitzvah to explicitly declare a firstborn animal a Bechor, even though it is already holy when it is born.
4. The Mishnah discusses what type of year is considered a year in which a person cannot redeem his Sedeh Achuzah.
5. A man may not give over his daughter to be a Shifchah while she is a Na'arah.
A BIT MORE
1. Rav Yehudah maintains that Cherem, when unspecified, means a consecrated gift to Hekdesh (and not a gift to the Kohanim), and that one may redeem Hekdesh for far less than its value, especially nowadays when there is no Beis ha'Mikdash. Although one Perutah (a small copper coin) could have been used to redeem the Cherem, Rav Yehudah instructed him to take four Zuz in order to publicize this law (that one should not benefit from Hekdesh even nowadays without a proper redemption).
2. They are: Eved Ivri, Sedeh Achuzah, Sedeh ha'Cherem, Batei Arei Chomah, and Ger Toshav.
3. The Rabanan derive this from the verse, "Takdish" -- "you shall sanctify [the firstborn animal]."
4. Although the Halachah is that one cannot redeem his Sedeh Achuzah for two years, those must be years when crops can be grown in the field. Accordingly, years of drought or a Shemitah year do not count as one of those two years.
5. Although the Torah does not explicitly state this, it is derived from a Kal va'Chomer: If the Torah states that a girl who was sold as a Shifchah while a minor is freed when she becomes a Na'arah, then certainly a Na'arah cannot be sold.
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