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1. One is permitted to harvest grain before the harvesting of the Omer order to clear out space in the field for a house of mourning or for a Beis Midrash, because it is for a Mitzvah.
2. The barley for the Minchas ha'Omer should be harvested Lishmah. It should be harvested while the grain is damp, on the night of the sixteenth of Nisan.
3. The entire night is valid for the burning of the Eimurim of a Korban and for the harvesting of the Omer.
4. If the Kohen was in the process of bringing the Minchas ha'Omer and it became Tamei, if it is still possible to harvest more grain, a replacement should be brought. If it is not possible, the Kohen should be silent and bring the Minchah b'Tum'ah.
5. Rebbi Elazar b'Rebbi Shimon says that if the Minchas ha'Omer becomes Tamei, even if it is possible to harvest more grain, the Kohen should be silent and bring the Minchah b'Tum'ah.
6. Rebbi Shimon says that although it is possible to delay the burning of the limbs of the Temidim and Musafim of Shabbos until after Shabbos, they are burned on Shabbos because a Mitzvah in its proper time is very dear.
7. There is a disagreement about whether the harvesting of the Minchas ha'Omer may be done on Shabbos if the sixteenth of Nisan falls on Shabbos.
8. All Korbenos Tzibur are brought on Shabbos, including the Korbanos brought together with the Minchas ha'Omer and the Shtei ha'Lechem of Shavuos.
9. According to Rebbi, the Shtei ha'Lechem of Shavuos may be baked on Shabbos in the event that Shavuos falls on Shabbos.
10. If the Shechitah and Zerikah of the Kivsei Atzeres are done Lishmah, the Shtei ha'Lechem become sanctified and may not be brought with any other Kevasim.
11. If the Shechitah of the Kivsei Atzeres is done Lishmah, but not the Zerikah, the breads are partially sanctified, according to Rebbi. According to Rebbi Elazar b'Rebbi Shimon, they are not sanctified.
A BIT MORE
1. However, the harvested grain should not be made into bundles, but should be left loose in the fields.
2. However, b'Di'eved if it was not harvested Lishmah, or if the grain was dry, it is valid.
3. However, the Shechitah and Zerikah of a Korban may be done only at night.
4. A Minchas ha'Omer is a Korban Tzibur. Therefore, it may be brought b'Tum'ah. However, if it is possible to bring a replacement, it is preferable to do so, since b'Di'eved the harvesting of the Omer may be done during the day and there is a concern that if it is brought b'Tum'ah people will erroneously assume that even a Minchas Yachid may be brought b'Tum'ah.
5. Rebbi Elazar b'Rebbi Shimon maintains that the harvesting of the Omer may be done only at night, not during the day, and thus the option of harvesting more grain does not exist. Accordingly, it is brought b'Tum'ah.
6. Since the Shechitah of the Temidim and the Musafim may be done on Shabbos, the Haktarah may be done on Shabbos as well, even though it could be delayed until after Shabbos.
7. According to the Tana of the Mishnah, it may be done on Shabbos. Rebbi disagrees.
8. A Keves is brought with the Minchas ha'Omer, and two Kivsei Atzeres are brought with the Shtei ha'Lechem of Shavuos. They may be brought even if the sixteenth of Nisan or Shavuos falls out on Shabbos.
9. According to Rebbi, the oven in the Beis ha'Mikdash sanctifies the Shtei ha'Lechem. If they were baked on Erev Yom Tov, they would become Pasul with Linah, and therefore they may be baked on Shabbos.
10. The breads were already sanctified when they were baked, according to Rebbi. However, the Shechitah sanctifies them so that they may be brought only with these Kevasim, and not with any other Kevasim.
11. According to Rebbi, the Shtei ha'Lechem are sanctified, and thus if they are taken out of the Azarah they become Pasul with Yotzei and may not be used with other Kevasim.
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