Rif Eruvin 31a {Eruvin 94a continues ... 95a}

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31a

{Eruvin 94a continues}
Gemara:
We conclude that their argument is about the sides of the public domain. Rabbi Eliezer holds that the sides of the public domain are like the public domain, and the Sages hold that the sides of the public domain are not like the public domain.

Mishna:
A courtyard that is breached into the public domain from its two sides, and similarly a house that is breached from its two sides, and similarly an alleyway whose beams or side-posts have been removed - are permitted on that Shabbat and prohibited for the future. These are the words of Rabbi Yehuda.
Rabbi Yossi says: If they are permitted for that Shabbat, they are permitted for the future; and if they are prohibited for the future, they are prohibited for the Shabbat.

Gemara:
With what {breach} are we dealing? If one that is ten {cubits but no more}, how does one side differ, which is permitted for we declare it {=the breach} an entrance. In the case of two sides, let us also declare it an entrance!
Rather, it {=the breach} is greater than 10 {cubits}. If so, even from one side also {should be forbidden}.

Rav said: In truth, with 10 {cubits as a breach}, {Eruvin 94b} but it occurred in the corner, for people do not make doors at corners.

"and similarly a house that is breached...":
Why is {breached} from one direction different that we say that {halachically} the mouth of the ceiling descends and closes? From two directions we should also say that the mouth of the ceiling descends and closes! (They said in the academy of Rav in Rav's name: A house which is breached in its corner. For an entrance in the corner people do not make. And so too a house that is breached from its two sides) Rav establishes it such that it is breached in its corner and the ceiling is slanting such that we cannot say that the mouth of the ceiling descends and closes.

It was stated {by Amoraim}:

An exedra {= An often semicircular portico with seats that was used in ancient Greece} situated in a valley:
Rav said: it is permitted to move {objects} throughout it {the exedra}, and even though it only has three partitions, we say that the mouth of the ceiling descends and closes.
And the halacha is like him.

{Eruvin 95a}
"Rabbi Yossi says: If they are permitted...":
It was a question to them:
Did Rabbi Yossi intend to forbid or permit?
Rav said: To forbid.
And so said Rabbi Yochanan: to forbid.
A brayta also says so: Rabbi Yossi says: Since they are prohibited for the future, they are forbidden for that Shabbat.

It was stated {by Amoraim}:
Rabbi Chiyya bar Ashi cited Rav: The halacha is like Rabbi Yossi.
And so is the halacha.

Mishna:
If a person builds an upper chamber on top of two houses, and similarly bridges that have thoroughfares, one may carry under them on the Shabbat. These aer the words of Rabbi Yehuda.
And the Sages prohibit.

And Rabbi Yehuda further said: One may make an eruv for an alleyway that is a thoroughfare {mefulash}. And the Sages prohibit.

END PEREK NINE - kol gaggot

BEGIN PEREK TEN

Mishna:
If a person finds tefillin, he may carry them in, pair by pair.
Rabban Gamliel says: Two by two.
To what does this apply? To old ones.