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Moed Katan, 21
1) HALACHAH: TEACHING TORAH DURING AVEILUS
OPINIONS: The Beraisa states that although an Avel is not allowed to learn Torah during his Aveilus, nevertheless if the public needs him ("Rabim Tzerichim Lo"), he may teach Torah to them. The Gemara says that Rebbi Yosi indeed taught Torah publicly while he was an Avel, and so did Rabah bar bar Chanah and Rebbi Yehudah bar Ila'i.
21b2) HALACHAH: GREETING AN AVEL
OPINIONS: The Gemara concludes that a person should not greet an Avel with "Shalom" even after the Shiv'ah is over, until thirty days have passed. If the Avel is mourning for the passing of his father or mother, then one may not greet him until twelve months have passed. Is this prohibition practiced today?Next daf(a) The RITVA and CHIDUSHEI HA'RAN write that they have not seen this Halachah observed, but they write that they do not know why it should be permitted. he SHULCHAN ARUCH (YD 385:1) quotes the Halachah of the Gemara and says that greeting an Avel with "Shalom" is indeed prohibited.HALACHAH: The SHACH and MAGEN AVRAHAM (OC 554:21) write that, l'Chatchilah, a person should be stringent and observe the Halachah as it is expressed by the Gemara, but if someone is lenient he does not have to be rebuked.