Rif Succah 11b {Succah 26b; 24b - 25a}

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11b

{Succah 26b, Mishna, continues}
of water, and they said: bring it into the succah.
And when they gave to Rabbi Tzadok less than an egg's volume, he took it in a napkin and ate it outside the succah, and did not bless {a bracha achrona} after it.

{Succah 24b}
Gemara:
Rav Acha bar Yaakov said: A partition which is unable to stand in a common wind is not considered a partition {=wall}.
And so is the halacha.

{Succah 25a}
"Agents engaged in a commandment are exempt from succah":
From where do we know this? For they learnt in a brayta:
{Devarim 6:7:

ז וְשִׁנַּנְתָּם לְבָנֶיךָ, וְדִבַּרְתָּ בָּם, בְּשִׁבְתְּךָ בְּבֵיתֶךָ וּבְלֶכְתְּךָ בַדֶּרֶךְ, וּבְשָׁכְבְּךָ וּבְקוּמֶךָ.

7 and thou shalt teach them diligently unto thy children, and shalt talk of them when thou sittest in thy house, and when thou walkest by the way, and when thou liest down, and when thou risest up.

}
בְּשִׁבְתְּךָ בְּבֵיתֶךָ - this is to exclude one who is involved in a mitzvah.
וּבְלֶכְתְּךָ בַדֶּרֶךְ - this is to exclude a bridegroom.

{Succah 25b}
R' Abba bar Zavda cited Rav: A mourner is obligated in succah.
This is obvious!
I would have said that since Rava said that one who is pained {by sitting in the succah} is exempt from succah, this one too is pained. Therefore it tells us that this refers to aggravation caused naturally {from the succah}, but here, he himself is pained and he needs to divert his attention.

R' Abba bar Zavda cited Rav: A bridegroom and his attendants and all members of the wedding party are exempt from the succah all seven {days}.

The Sages learnt {in a brayta}: The bridegroom and his attendants and all members of the wedding party are exempt from prayer {=Shemoneh Esrei} and from tefillin and are obligated in reading the Shema.