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prepared by Rabbi Eliezer Chrysler
Kollel Iyun Hadaf, Jerusalem

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Eruvin 46

ERUVIN 46 - was generously dedicated by an anonymous donor in Los Angeles.


(a) Why is the water of rivers and fountains not Koneh Shevisah?

(b) Rebbi Ya’akov bar Idi quoted Rebbi Yehoshua ben Levi, who rules like Rebbi Yochanan ben Nuri. In fact, that is precisely what his Rebbi told him. The Gemara however, suggests that he may only have deduced this from another statement of his.
What would that be?

(c) According to the Gemara’s suggestion, Rebbi Yehoshua ben Levi still needed to state ‘Halachah ke’Divrei ha’Meikil be’Eruv', because otherwise, we would have thought that he rules like Rebbi Yochanan ben Nuri even Lechumra.
Which Chumra?

(d) Why does he still need to rule specifically like Rebbi Yochanan ben Nuri? Why would we not know that from his other ruling?

(a) What does Rebbi Eliezer hold with regard to a young woman who saw blood after ninety days.
What exactly is the case, and what do the Rabbanan hold there?

(b) ‘After he remembered’, Rebbi ruled like Rebbi Eliezer because it was a case of emergency. What does ‘after he remembered’ mean? Why can it not mean after he remembered that the Halachah is not like Rebbi Eliezer?

(c) Why did Rebbi consider that case one of emergency?

(d) What Kashya does Rav Papa ask from here on Rava, who holds that, since Eruvin is only mi’de’Rabbanan, we should follow the lenient opinion - even it is the minority opinion?

(a) 'Shemu'ah Kerovah Noheges Shiv'ah u'Sheloshim'.
What is the difference between Shiv'ah and Sheloshim?

(b) This is the opinion of Rebbi Akiva.
What does he hold by Shemu'ah Rechokah?

(c) What ruling does Rabah bar bar Chanah issue in the name of Rebbi Yochanan in this regard, and what does the Gemara mean when it adds that he holds like Shmuel? What does Shmuel say?

(d) What Kashya does Rav Mesharshaya ask from here on Rava?

Answers to questions



(a) Rav Papa explains that Rebbi Yehoshua ben Levi found it necessary to rule like Rebbi Yochanan ben Nuri, in order to include Eruv Techumin in the ruling. This is because his original ruling concerned only Eruv Chatzeros, whose Halachos are more lenient.
Which Tana actually differentiates between Eruvei Techumin and Eruvei Chatzeros in this point, and why should there be a difference between them?

(b) How does Rav Ashi explain Rebbi Yehoshua ben Levi's two rulings by differentiating between Techilas Eruv and Shiyurei Eruv? What is Shiyurei Eruv, and which Tana makes such a distinction?

5) What is the meaning of ‘ve’Lo Amru le’Arev Chatzeros Ela Kedei she’lo Leshakach Toras Eruv min ha’Tinokos'?


(a) Like which three Tana’im does the Gemara rule, whenever they argue with a contemporary?

(b) The ruling like Rebbi Yossi, says the Gemara, is even when he argues against a majority opinion. This might be an absolute ruling, but it might also just mean ‘Matin’ or ‘Nir’in’.
What is the meaning of ...

  1. ... ‘Matin’?
  2. ... 'Nir’in’?
  1. ... Do we rule like Rebbi Meir when he argues with either Rebbi Yehudah or Rebbi Yossi?
  2. ... Like whom is the Halachah when Rebbi Yehudah argues with Rebbi Yossi?
(d) How can we learn from a Kal va’Chomer that when Rebbi Shimon argues with Rebbi Yossi, the Halachah is like the latter?
7) Whose opinion do we follow when Rebbi Meir argues with Rebbi Shimon?

8) We learnt a Mishnah earlier (45b) where Rebbi Shimon rules leniently by three courtyards which open into the street etc. Rav is quoted as ruling like Rebbi Shimon, in spite of the fact that it is Rebbi Yehudah who argues with him. Why is this not a proof for Rav Mesharshaya, who disagrees with Rebbi Yochanan's rules (in 6)?


(a) What is an ‘Ir shel Rabim ve'Na'asis shel Yachid’?

(b) Why can one not make an Eruv to cover the whole town?

(c) Rebbi Yehudah requires fifty residents living outside it, before one is permitted to make one Eruv for the whole town.
What does Rebbi Shimon hold? What is the reason of both opinions?

(d) Here too, Rav is quoted as ruling like Rebbi Shimon.
Why is this not a proof for Rav Mesharshaya?

Answers to questions
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