(Permission is granted to print and redistribute this material
as long as this header and the footer at the end are included.)


prepared by Rabbi Eliezer Chrysler
Kollel Iyun Hadaf, Jerusalem

Previous daf

Eruvin 87

ERUVIN 87 - has been dedicated by Rabbi Dr. Eli Turkel of Ra'anana, Israel, to the memory of his father, Yisrael Shimon ben Shlomo ha'Levi Turkel.


(a) Rabah equates Rebbi Yehudah in our Mishnah (who permits a Mechitzah over the Uka even if it does not reach the walls of the Uka) with Rebbi Chananya ben Akavya.
What does *he* say regarding a board of four Amos by four Amos, and what is the connection between them?

(b) Why might ...

  1. ... Rebbi Yehudah not agree with Rebbi Chananya ben Akavya?
  2. ... Rebbi Chananya ben Akavya not agree with Rebbi Yehudah?
(a) Abaye points out that if the plank of which Rebbi Chananya ben Akavya speaks would be lying on two brackets that were fixed to a wall, with the edge of the plank within three Tefachim from the wall, it would only need to be eleven Tefachim and a fraction of a Tefach wide by Ten Amos. Why is that?

(b) What would the dimensions of the board need to be if, in the previous case, it was placed ...

  1. ... *vertically* rather than horizontally, and how far from the wall would it need to be placed ...?
  2. ... vertically within three Tefachim of *a corner*, rather than a wall?
(c) Considering the three previous cases, how was the plank in the original case of Rebbi Chananya ben Akavya placed?
(a) What status does a stream of water (of four Tefachim wide and ten tefachim deep) that passes through a Chatzer have (i.e. what Reshus is it), and what must one do to permit the residents of the Chatzer to draw from it?

(b) Why will a Mechitzah Teluyah not help here?

(c) What does Rebbi Yehudah hold in this case?

(d) Rebbi Yehudah tries to prove his point from the stream of Avel, which the elders permitted via a Mechitzah Teluyah.
On what grounds do the Rabbanan refute Rebbi Yehudah's proof?

4) What is the status of a stream of water that is less than ten Tefachim deep and four Tefachim wide, if it passes through ...
  1. ... a Reshus ha'Rabim?
  2. ... a Reshus ha'Yachid?
(a) If a stream passes by the windows of a series of houses in a Mavoy or a Chatzer, the Tana Kama permits lowering a bucket when there are *three* Tefachim, and Raban Shimon ben Gamliel when there are *four*? What are they talking about, and what is the basis of their Machlokes?

(b) Why does the Gemara reject the suggestion that they are arguing about the width of the stream?

(c) How do we reconcile this with Rav Dimi Amar Rebbi Yochanan, who forbids using a Makom Petur to switch from one Reshus to another?

Answers to questions



(a) We just learnt that Rav Dimi quoting Rebbi Yochanan permits switching from one Reshus to another (provided they are not both Reshuyos d'Oraysa) via a Makom Petur.
How do we then explain Rebbi Yochanan above (77a) who permits the residents of both courtyards to use a wall that is not four Tefachim wide, provided they do not switch from one Chatzer to the other (even though they are not Reshuyos d'Oraysa)?

(b) How will Ze'iri explain the Machlokes between the Tana Kama and Raban Shimon ben Gamliel in the Beraisa?

(c) What does the Gemara mean when it asks on Ze'iri 've'Tehavi Ki Chorei Karmelis'?

(d) Some answer that there is no Din of Chorin by a Karmelis.
What does Rav Ashi say about that?

7) Ravina comes up with a surprise explanation in the Machlokes Raban Shimon ben Gamliel and the Rabbanan (whether the stream is permitted by *three* Tefachim or *four*).
What is it?


(a) Why, according to the Tana of our Mishnah, will a horizontal ledge suspended above the water not permit one to draw water on Shabbos - irrespective of its size?

(b) What must one then do to be able to draw water from below?

(c) Rebbi Chananya ben Akavya permitted the men of Teverya to draw water via a horizontal ledge of four square Amos, as we learnt above. He also permitted them to wrap with Atza (the waste of legumes). This had nothing to do with Shabbos.
In which connection did he issue this ruling?

(a) The third concession of Rebbi Chananya ben Akavya to the men of Teverya concerned drying oneself after bathing.
What was it?

(b) What does Rebbi Shimon permit in this regard, over and above the Tana Kama of the Beraisa?

(c) Why does the Tana Kama forbid carrying the towel home?

(d) Why is giving the towel to the bath-attendant prohibited?

Answers to questions
Next daf

For further information on
subscriptions, archives and sponsorships,
contact Kollel Iyun Hadaf,