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ERUVIN 66
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ERUVIN 66 (4 Sivan) - Dedicated by Rabbi Kornfeld's father, Mr. David Kornfeld, in memory of the members of his family who perished at the hands of the Nazi murderers in the Holocaust, Hashem Yikom Damam: His mother (Mirel bas Yakov Mordechai), brothers (Shraga Feivel, Aryeh Leib and Yisachar Dov sons of Mordechai), grandfather (Reb Yakov Mordechai ben Reb David Shpira) and aunt (Charne bas Yakov Mordechai, the wife of Reb Moshe Aryeh Cohen zt'l). Their Yahrzeit is observed on 4 Sivan.

SUMMARY

1. The Gemara discusses how a person who rents a Nochri's share in a Chatzer is like one who makes an Eruv.
 
2. Shmuel cites laws regarding when one may nullify his domain to allow others to carry.
 
3. Nullifying cannot be done when the residents of two courtyards do not forbid each other from carrying into their respective yards, but they may make an Eruv together.
 
4. The Gemara concludes that nullification cannot take place if a Nochri arrives in the courtyard on Shabbos.
 
5. There is a dispute about whether the owners of two houses that both open into a ruin can nullify their domain to each other.

A BIT MORE

1. The Gemara originally says that this means that he must rent the Nochri's share from before Shabbos. The Gemara concludes that this in fact provides leniencies, such as paying less than a Perutah and using the agency of the Nochri's worker (see Daf 64, #1).
 
2. If the residents of two adjacent courtyards would forbid each other from carrying in their courtyards, but they could also make an Eruv, they may also nullify their domain to each other.
 
3. This is the law in a case where there are two courtyards side by side that have one opening in between them. The residents of one courtyard cannot nullify their domain to [a person in] the other courtyard so that the other courtyard can carry into both courtyards on Shabbos (but they may make an Eruv to allow this).
 
4. This is because nullification was instituted only when an Eruv could have been made to permit carrying (in a case where an Eruv is necessary to permit carrying in the courtyard) once the nullification was done. Since an Eruv may be made only before Shabbos, nullification cannot be done on Shabbos, when it is too late to make an Eruv.
 
5. Rebbi Yochanan: They can, and are thereby able to carry in the ruin and courtyard. Shmuel: They cannot, as the Chachamim allowed the leniency of nullification only when it was regarding a front yard, where a person's primary usage is, as opposed to a ruin.

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