ANSWERS TO REVIEW QUESTIONS
prepared by Rabbi Eliezer Chrysler
Kollel Iyun Hadaf, Jerusalem
Previous dafEruvin 12
ERUVIN 11-15 sponsored by a generous grant from an anonymous donor. Kollel Iyun Hadaf is indebted to him for his encouragement and support and prays that Hashem will repay him in kind.
(a) The Gemara tries to prove from the words of Rebbi Yossi ben Pereida
've'Chi Lesosmo Ani Tzarich'? - that when his Rebbi Rebbi Eliezer instructed
him to place a second Lechi, he must have meant a second Lechi as well as a
Koreh; otherwise, what did Rebbi Yossi ben Pereida mean by those words?
Lechayayim *with* a Koreh closes the Mavoy, *without* it, they don't?
(b) What Rebbi Yossi ben Pereida may have meant to ask was - 've'Chi Lesosmo
bi'Lechayayim Ani Tzarich' ('Do I need to fill up the entire space with
(c) Rebbi Eliezer's reply was 'Yisasem, ve'Ein Bekach Kelum'!
(a) When Raban Shimon ben Gamliel says that Beis Shamai and Beis Hillel
agree that a Mavoy which is less than four Amos wide does not require any
Tikun at all - he means that it does not require a Lechi and a Koreh like
Beis Shamai, nor two Lechayayim like Rebbi Eliezer, but just a Lechi or a
Koreh like Beis Hillel.
(b) The minimum width for a Mavoy to require a Tikun - is four Tefachim.
(c) Rebbi agrees with Rebbi Eliezer, but the Rabbanan of Rebbi do not.
According to them, *one* board will suffice by a Chatzer, too.
(a) We cannot say that, for a Chatzer, Rebbi Yochanan requires two Pasim of
four Tefachim each - in view of the Beraisa that we quoted earlier (9b):
'Ketanah be'Eser, u'Gedolah be'Achas-Esrei' - which means that the two Pasim
between them total only six Tefachim (and not eight, as we are currently
suggesting in Rebbi Yochanan).
(b) When Rebbi Zeira came in from the sea, he explained that - either one
requires *one* board of four Tefachim, or *two* of even a Kol Shehu.
(c) The Beraisa of 'Ketanah be'Eser, u'Gedolah be'Achas-Esrei' - goes like
Rebbi (who requires two Pasim); and Rebbi in turn, holds like Rebbi Yossi
(who requires each Pas to be at least three Tefachim).
Note: The Gemara refers to a Lechi when it speaks about a Mavoy, but calls
it a Pas when dealing with a Chatzer. In fact, there is no difference
between them (see Tosfos DH 'be'Pasei'). Likewise, I refer to a Lechi
sometimes as a plank, and sometimes as a board; this is purely a matter of
style - no distinctioon should be drawn between them.
(a) Rav Yehudah quoting Shmuel, permits a Chatzer with *one* plank - only
when the sea flows into the Chatzer (it is one of the lenient rulings that
Chazal issued by water).
(b) According to him, a regular Chazter requires either that the majority of
the wall still remains standing, or two boards.
(c) Chazal also permitted a suspended wall (that does not reach within three
Tefachim of the water) by water.
(a) If the remaining wall was seven Tefachim - it would not require a board
of *four* Tefachim, answers the Gemara; three Tefachim plus would suffice.
Why? Because Rav Achli rules that an area that is less than four Tefachim
wide does not require a Tikun - and if one placed a board of three Tefachim
plus would leave a space of less than four Tefachim.
(b) The Gemara's first answer (to refute the previous Kashya and reinstate
the answer that the breached wall is only seven Tefachim across) - is that
Rav Achli only exempted a space of less than four Tefachim from a Tikun by
*a Mavoy*, but not by *a Chatzer*. Consequently, a breached wall of seven
Tefachim in a Chatzer *would* need a board of four Tefachim to make up Rov
(a) If sea-water enters a Chatzer via a breach in the wall - no Tikun is
required, provided the breach is not more than ten Amos wide.
(b) If the breach is more than ten Amos wide - then it requires a Mechitzah
of at least ten Tefachim tall. The Tikun is in order to permit filling water
from it (according to Tosfos Amud 2 DH 'Hacha', the Gemara is referring to
carrying from the house to the Chatzer) but not to carry, which is permitted
(c) No! It is not a Reshus ha'Yachid which opens into a Karmelis - because
we are speaking when part of the wall on either side is still standing up to
a height of ten Tefachim (only it is covered by the sea-water).
(d) No! The above does not apply to a wall of a Chatzer that is *completely*
breached. In that case, a breach of less than ten Amos would have the same
Din as one of more than ten Amos, and would therefore require a Tikun.
(a) Rav Yehudah says that someone who throws from a Reshus ha'Rabim into a
Mavoy which has a Lechi, is Chayav - because 'Lechi Mishum Mechitzah' (so he
has thrown into a Reshus ha'Yachid); but Patur if it has a Koreh - because
Koreh Mishum Heker (so he has not thrown into a Reshus ha'Yachid).
(b) At this stage, we think that a Reshus ha'Yachid, according to Rav
Yehudah, requires four walls (both Lekula and Lechumra).
(c) Since Rav Yehudah said 'she'Lo Nishtatfu Bah' - we can infer that, had
they made an Eruv, the thrower would be Chayav, even if the Tikun of the
fourth wall consisted of a Koreh. But since when, asks Rav Sheshes, does the
loaf of Eruv Chatzeros transform a Mavoy into a Reshus ha'Yachid (and we
even have a Beraisa to this effect)?
(d) Chazal forbid carrying from a house flanking a public Chatzer into the
Chatzer - because one is carrying from a private domain into a public one,
which resembles carrying from a Reshus ha'Yachid into a Reshus ha'Yachid.
They were afraid that, if one were to permit the former, one may come to
permit the latter, too.
(a) Rav Sheshes amends Rav Yehudah's words to read 'Mavoy she'Eino Ra'uy
le'Shituf (meaning that it is 'Mefulash'), Hechshero be'Lechi ...'.
(b) According to the new text, a Reshus ha'Yachid will require not *four*
walls min ha'Torah, but *three*.
(c) Rava maintains 'Zeh va'Zeh (both a Lechi and a Koreh) Mishum Heker.
(d) Rava explains 'ha'Zorek le'Mavuy, Yesh Lo Lechi, Chayav' - to mean that
if it needs no more than a Lechi (i.e. that it is not Mefulash), then he is
Chayav, because min ha'Torah, a Reshus ha'Yachid comprises *three* walls;
'Ein Lo Lechi, Patur' - that if it needs a Lechi plus something else (i.e. a
Tzuras ha'Pesach), then he is Patur, even if the fourth side has a Lechi.
(a) According to Rebbi Yehudah, someone who owned a house on either side of
the street, would be able to rectify that section of road - by placing a
Lechi or a Koreh on either side of that section.
(b) We see from Rebbi Yehudah, that both the 'Lechi and the 'Koreh are
because of Mechitzah' (and the Rabbanan argue only whether a Reshus ha'Rabim
can be rectified in this way, but not on the function of a Lechi or a Koreh)
- Consequently, we have a Kashya on Rava (who holds that 'Lechi ve'Koreh
Mishum Heker') from both Rebbi Yehudah and the Rabbanan. (See Gilyon
ha'Shas, as to why the Gemara confines the Kashya to Rava.)
(c) The Gemara answers - that, according to Rebbi Yehudah, min ha'Torah, a
Reshus ha'Yachid comprises no more than two walls (so it is possible that
the Lechi and the Koreh could serve as a Heker, and not as a Mechitzah -
(d) According to Rav Nachman - a square Mavoy, like a Chatzer, requires a
Pas of four Tefachim.
(a) A circular Mavoy, just like a square one, is permitted by means of a
Lechi or Koreh.
(b) Rav, quoting his uncle, told Shmuel that as long as the Mavoy is longer
than it is wide - even by a Mashehu, it retains the Din of a Mavoy, and is
permitted by a Lechi or a Koreh.
(c) Rav's uncle was called Rebbi Chiya.