THOUGHTS ON THE DAILY DAF
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Rosh Kollel: Rav Mordecai Kornfeld
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ERUVIN 42, 43, 44 - 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.
1) HALACHAH: ONE WHO WAS TAKEN OUT OF HIS "TECHUM" ON SHABBOS
OPINIONS: Rav and Shmuel argue whom the Halachah follows in a case where a
person was forcibly taken out of his Techum Shabbos to an enclosed area.
Rav says that the Halachah follows Raban Gamliel, and the person may walk
throughout the entire enclosed area. Shmuel says that the Halachah does
not follow Raban Gamliel in this case, and one may only walk within his
four Amos. Shmuel agrees, though, that the Halachah follows Raban Gamliel
with regard to traveling on a boat on Shabbos, that one may walk
throughout the entire boat.
2) THE HALACHOS TAUGHT BY ELIYAHU HA'NAVI
What is the Halachah?
(a) The RI cited by Tosfos (DH Halachah) and the RAMBAM rule in accordance
with Rav, that one may walk throughout the area enclosed by the Mechitzos.
HALACHAH: Is it permitted to travel in a boat on Shabbos altogether?
(b) The RASHBAM (also cited by Tosfos) and RABEINU CHANANEL rule like
Shmuel that one may walk only four Amos, except in a boat where one may
walk throughout the entire boat.
(a) The RASHBAM (cited by Tosfos, DH Halachah) says that a person *may*
ride in a boat on Shabbos, and he may even board the boat on Shabbos.
Even though the Beraisa in Shabbos (19a) says that one may not embark on a
boat within three days before Shabbos, the Rashbam explains that that
Beraisa is according to Beis Shamai, but Beis Hillel permits boarding a
boat before Shabbos and even on Shabbos.
Even though Beis Hillel maintains that normally, when doing something
prior to Shabbos that will cause a Melachah to be done on Shabbos, one
must allow enough time for the Melachah to be completed before Shabbos,
that applies only in the other cases which look like Amira l'Nachri, it
appears that one is telling a gentile to do Melachah for him on Shabbos.
Here, in the case of boarding a boat, it does not look like Amira
l'Nachri, because the gentile will be piloting the boat regardless of
whether or not the Jew is on it. (MAHARSHA)
(b) The RITZBA disagrees with the Rashbam, based on the Gemara in Shabbos
(19a) which says that one may not embark on a boat within three days
before Shabbos. Even though that Halachah is referring to a large sea,
even if one goes in a boat on a river it is still prohibited to board *on*
Shabbos, because it is included in the Gezeirah against swimming (the
Rabanan enacted that one may not swim in a body of water on Shabbos lest
one inadvertently construct a flotation device); alternatively, it is
prohibited to board the boat on Shabbos because the Rabanan feared that
one might steer the boat, taking it more than four Amos in a Karmelis. He
may, though, board a boat *before* Shabbos which will be traveling in a
river and not a sea.
QUESTION: The Gemara says that someone taught seven Halachos in Sura at
the beginning of Shabbos and taught them in Pumpadisa at the end of
Shabbos. The Gemara first assumes that the person teaching those Halachos
was Eliyahu ha'Navi (because only he is able to travel so fast in one
day), and the Gemara concludes that it was Yosef the Shade (who does not
It seems from the Gemara that the Halachos would be accepted even if it
was known for sure that Eliyahu had taught them. We see this also in
Berachos (3a), where Rebbi Yosi learned a number of Halachos from Eliyahu.
We find also in a number of places that certain Halachic questions remain
in doubt "until Eliyahu comes to resolve them for us" (see, for example,
Sanhedrin 44a and Menachos 32a).
How do we reconcile this with the teaching of RASHI (Shabbos 108a) who
says that we cannot rely on Eliyahu for Halachic questions of Isur
v'Heter, but only for questions of "fact or fiction?" In addition, the
Gemara in Temurah (16a) teaches that we may not rely on a prophet even to
remind us of a Halachah le'Moshe mi'Sinai that was forgotten!
(a) The MAHARATZ CHAYOS in Berachos (3a) explains that it depends whether
Eliyahu ha'Navi is saying a Halachah as a prophecy, or Nevu'ah, from
Hashem, or he is saying it as his own, personal opinion of Da'as Torah. In
the latter case, we may accept it from him. When Rashi in Shabbos says
that Eliyahu cannot teach us a Halachah, he means that Eliyahu cannot
teach us Halachos as the Eliyahu *ha'Navi*, in his role as a prophet. But
as a normal person, he is able to teach us Halachos.
(b) Similarly, when Eliyahu is not saying a prophecy but is saying a
Halachah that was once taught, we certainly accept it. Only when he
teaches something that was never taught before and he is teaching it is as
a prophet, do we not accept it.