POINT BY POINT SUMMARY
Prepared by R. Yakov Blinder
of Kollel Iyun Hadaf, Yerushalayim
Rosh Kollel: Rabbi Mordecai Kornfeld
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Previous daf Moed Katan 4
1) RAV DIMI, WHILE IN ERETZ YISRAEL (cont.)
2) WHY IS COLLECTED RAIN WATER FORBIDDEN?
6. Rav Nachman bar Yitzchak gives an answer, but it is
7. Real answer: It is true that R. Akiva derived this
from this verse, but R. Yishmael interpets the verse
entirely different (he says it is taking about
Shabbos, not Shemitah). According to R. Yishmael,
then, the additional periods are Halachah l'Moshe
mi'Sinai. R. Asi's statement was in accordance with
R. Yishmael's view.
8. R. Yochanan disagrees with the above, and says that
Raban Gamliel abolished the entire additional
period, all the way down to Rosh Ha'Shanah. This is
because he (R. Gamliel) derived from a Gezerah
Shavah that there is no such thing as an additional
period to Shemitah.
i. Question: How can a Gezerah Shavah uproot an
explicit Halachah l'Moshe mi'Sinai?
ii. Answer: R. Ashi revises R. Yochanan's
statement: The reason R. Gamliel abolished the
entire additional period down to Rosh ha'Shanah
is that he held like R. Yishmael, that the
additional period is a Halachah l'Moshe
mi'Sinai, and he also held that this Halachah
l'Moshe mi'Sinai was explicitly limited to
Temple times, and is inoperative nowadays.
(a) Question: The Mishnah prohibits watering from collected
rain water and from a Kilon (a deep well requiring much
exertion). Why is collected rain water forbidden?
3) WATERING A FIELD FROM A POOL OF WATER (1)
(b) R. Ila'a's answer: It is a Gezerah - if we allow
rainwater, people will also use a Kilon.
(c) R. Ashi's answer: Rainwater itself is often as much
exertion as a Kilon - when its surface level begins to go
(d) [The following (until (e)) is based on Rashi MS, Kupfer,
Mekitzei Nirdamim 5721.] The Gemara says that these two
Amora'im would disagree about R. Zeira's ruling: Rivulets
that flow from pools of water (and never become depleted)
are permitted on C.H.; we do not make a Gezerah that
people will use a Kilon. R' Ila'a would disagree with
this ruling; R. Ashi would agree (because the water in
these rivulets can never end up being a cause of
(e) In regard to R. Zeira's ruling, R. Yirmeyah asks, Isn't
this against the Mishnah, which forbids "Rainwater,"
seemingly including these rivulets that are rainwater?
(f) Answer: The reason for the Mishnah's general prohibition
of rainwater is that this rainwater could run dry,
requiring exertion to draw further water (as R. Ashi said
above, 9b). R. Zeira, however, was referring to the
rivulets of Bavel, which never run dry, and this concern
therefore does not apply to them.
(a) Beraisa: One may not water a field from pools that are
full of water (because they might dry up). But if there
is a channel that runs between them, it is permitted
(because then he can always use the channel water if the
pools dry out).
4) WATERING A FIELD FROM A POOL OF WATER (2)
(b) R. Papa: This is only true if there is enough water in
the channel to water most of the field. If not, he might
run out of water in the middle and exert himself to bring
more water from a distant place.
(c) R. Ashi: Even if there is not enough water in the channel
to water most of the field it is OK. This is because the
water in the channel comes and goes, and if there is no
water one day, there will be in another day or two, so he
will not go fetching faraway water now.
(a) Beraisa: A pool that gets water from the drippings of a
Beis ha'Shalchin further uphill can be used to water a
lower Beis ha'Shalchin.
5) MOVING WATER FROM ONE PATCH TO ANOTHER
(b) Question: Might not the pool run out of water (leading to
exertion to find other sources of water)?
(c) Answer: The Beraisa permits it only while the dripping
continues; in this case the pool will certainly not run
out of water.
(d) Abaye says: The Beraisa applies only when the spring
which supplies the upper Beis ha'Shalchin is still
(a) R. Shimon ben Menasya: One should not take water from a
lower patch and carry it up to a higher patch.
(b) R. Elazar bar Shimon: This applies even to a single
two-leveled patch - one should not take water from the
lower to the upper part.
(a) Beraisa: One may do "Madlin" to his vegetables to enable
their eating on C.H. (even though it involves exertion,
it is permitted because it is an immediate need for the
holiday - Ritva), but not to make them grow better (for
after C.H. - Ritva).
(b) Rava Tosfa'a thought "Madlin" means pruning branches, but
watering is never permitted except for Beis ha'Shalchin
and without exertion.
(c) Ravina corrected him: "Madlin" means drawing water.
7) THE MISHNAH FORBADE MAKING "UGIYOS" UNDER VINES.
(a) "Ugiyos" refers to what is called Bankei in Aramaic, and
Bedidin in a Beraisa - namely, digging circles in the
ground around the bases of vines (to hold water).
8) R. ELAZAR BEN AZARYAH FORBADE DIGGING A WATER CHANNEL ON C.H.
AND ON SHEMITAH (SEE ABOVE 1:A:4)
(b) Question: Rav Yehudah permitted people to make these
Bankei in their vineyards on C.H.
(c) Answer: The Mishnah only forbids making new Ugiyos;
repairing old ones is permitted, and this is what R.
(a) Question: We understand C.H., because it involves
exertion. But what could possibly be wrong with digging a
channel on Shemitah? Two Amora'im suggest two approaches:
9) The Mishnah permitted repairing an existing channel on C.H. if it got
(b) Approach #1: It appears to others that he is hoeing his
land for agricultural purposes.
(c) Approach #2: It appears to others that he is preparing
the banks of the channel for planting crops.
(d) What is the Nafka Minah between the two approaches?
1. In a case where water runs into the channel
immediately as it is being dug. This does not appear
like hoeing, but it still looks like he is preparing
the banks for planting.
(e) Ameimar held Approach #1 and asked this question
accordingly: R. Elazar ben Azaryah says one may not pile
up manure for storage in his field on Shemitah (it looks
like he's fertilizing his field), unless he puts it on a
rock 3 Tefachim high - or digs a 3-Tefach hole. We see
that he was not concerned that digging (for
non-agricultural purposes) might appear to others to be
2. This Nafka Minah is rejected, because in fact both
Amora'im agree to Approach #2; the argument is over
whether there ALSO exists Approach #1. The real
Nafka Minah is in a case where he takes the dirt
being dug and throws it far away, not on the banks.
This does not look like preparation of the banks for
planting, but it can look like hoeing.
(f) Answer: R. Elazar ben Azaryah didn't mean that he should
dig a hole during Shemitah, but that if he had a hole
already dug he could use it for manure.
(a) What is the definition of "fixing a clog"? If it was
originally 6 Tefachim deep and is clogged until it is
only 1 Tefach deep (i.e., 5 Tefachim need to be cleared).
(b) Given: A 3 Tefach channel clogged until it is 1/2 Tefach
can't be cleared (because it is essentially useless
anyway). A 12-Tefach channel clogged until it is 2
Tefachim can't be cleared (because 10 Tefachim is too
much exertion to clear).
(c) Question: What about a 7-Tefach channel that is clogged
until it is 2 Tefachim? Is it permitted because it too
involves a 5-Tefach clearing, or is it forbidden because
he has to bend down an extra Tefach to clean it out, and
this is too much exertion? No decision is reached
(d) Abaye permitted removal of tree branches growing in the
(e) R. Yirmeyah permitted clear out the blocked source of the
(f) R. Ashi permitted clearing out silt from the river,
because this is a public need, which is permitted in the
Mishnah (above, 1b).