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SHABBOS 79

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1)
(a) If the size hide that one will be Chayav on Shabbos for tanning is one that is large enough to write a Kamei'a on it, then what will be the Shi'ur for which one will be Chayav for carrying?
(b) What did Rav Nachman reply when Rava asked him what the Shi'ur will be for carrying un-tanned hide?
(c) How did he extrapolate his answer from the Shiur of weaving and spinning threads on Shabbos?
(d) What is the Shiur for carrying a piece of hide that is not meant to be used for tanning?

2)
(a) The Shiur for carrying soaked dye is the amount that one would designate as a sample, and for un-sown seeds, a little less than a ki'G'rogeres according to the Tana Kama. What does Rebbi Yehudah ben Beseira say?
(b) The Shi'ur for carrying sewage-water is a Revi'is, and for dyes to be soaked dyes to be soaked, the amount that one would use to dye a piece of cloth that one places inside a woman's head-covering (which is a larger Shiur than that of soaked dye). What is the Shi'ur for carrying ...
1. ... manure or fine sand, to fertilize seeds that have been sown, according to Rebbi Akiva (according to the Rabbanan it is sufficient to fertilize a leek)?
2. ... clay (mixed with sewage-water)?
(c) How will we explain the apparent discrepancy between the two different Shiurim in all of these cases on the one hand, and the Shiurim of tanned and un-tanned hide (which have the same Shiur), on the other?
(d) And how will we reconcile Rav Nachman with the Beraisa, which gives a larger Shiur for untreated hide as piece large enough to cover a small weight?
(e) How do we then account for the Mishnah in Keilim, which gives the Shiur of Tum'ah for leather as five Tefachim by five Tefachim, and to which the Beraisa ascribes the equivalent Shiur for carrying on Shabbos?

3)
(a) We have just discussed the Shiur of untreated hide, known as 'Matzah'. There are two more categories of leather: 'Cheifah', which has been salted, and 'Dift'ra', which has also had flour added to it, but not 'Afeitzim' - gall-nuts (when it becomes Klaf). What is the Shiur for carrying ...
1. ... Cheifah?
2. ... Dift'ra?

4)
(a) Parchment manufactured from a complete hide is called 'G'vil'. What are 'Klaf' and 'Duchsustus'?
(b) The Beraisa writes 'Klaf ve'Duchsustus, K'dei Lichtov Alav Mezuzah'. What does this mean in practical terms, if taken literally?
(c) How does this statement clash with the Shiur given by the Tana in our Mishnah?
(d) What do we mean when we initially answer 'Mai Mezuzah, Mezuzah she'bi'Tefilin'?

5)
(a) The Tana Kama of the Beraisa renders a person Tamei if he touches the Ketzitzah (the box) of the Tefilin or even the straps, provided they are attached to the Ketzitzah. What does Rebbi Shimon ben Yehudah quote Rebbi Shimon as saying, regarding the straps?
(b) Rebbi Zakai quotes Rebbi Shimon as saying 'Tahor Ad she'Yiga bi'Mezuzah Atzmah'. What does 'Mezuzah' mean in this context? What do we prove with this?
(c) We just answered the current Kashya (the clash between the Beraisa, which says 'Klaf ve'Duchsustus, K'dei Lichtov Alav Mezuzah' and our Mishnah), by explaining 'Mezuzah' in the Beraisa to mean 'Mezuzah she'bi'Tefilin. On what grounds do we refute this explanation?
(d) How do we amend the Beraisa, and answer the Kashya - at one and the same time?

6)
(a) How do we initially understand Rav's statement 'Duchsustus, Harei Hu ki'Klaf'?
(b) How do we query Rav from our Mishnah 'Klaf K'dei Lichtov ... Parshah Ketanah she'bi'Tefilin, she'Hi Sh'ma Yisrael'?
(c) How do we answer this Kashya?

7)
(a) On which part of the Klaf does one write Tefilin, and on which part of the Duchsustus, Mezuzos ('Halachah le'Moshe mi'Sinai')?
(b) We just learned that Tefilin are Kasher if they are written on Duchsustus. What about writing Mezuzos on Klaf?
(c) In that case, how will we explain the Beraisa 'Shinah ba'Zeh u'va'Zeh, Pasul'?
(d) Alternatively, 'Shinah ba'Zeh u'va'Zeh' is a Machlokes Tana'im in a Beraisa, and Rav will hold like Rebbi Acha in a Beraisa. What does Rebbi Acha say?

8)
(a) Alternatively, Rav Papa suggests that Rav holds like Tana de'Bei Menasheh, who says 'Kasvah Al ha'G'vil ve'Al ha'Klaf ve'Al ha'Duchsustus, Kesheirah'. What leads us to believe that Tana de'Bei Menasheh is speaking about Tefilin and not Mezuzah?
(b) On what grounds do we reject this suggestion?
(c) So what must Tana de'Bei Menasheh be referring to?

9)
(a) How do we attempt to prove Rav's opinion (that Tefilin that are written on Duchsustus are Kasher) from the Beraisa 'Tefilin she'Balu ... Ein Osin Meihen Mezuzah, L'fi she'Ein Moridin ... '?
(b) We refute this proof too however, by establishing the Beraisa like Rebbi Shimon ben Elazar. What does Rebbi Shimon ben Elazar quoting Rebbi Meir say about writing a Mezuzah on Klaf.
(c) Why is that?

10)
(a) In light of what we just explained, how do we now amend Rav's statement 'Duchsustus, Harei Hu ki'Klaf?
(b) What is he coming to teach us?
(c) What does he now hold with regard to writing Tefilin on Duchsustus?

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