Rif Succah 22a {Succah 44a - 44b; 46a}

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22a

{Succah 44a}
Gemara:
It was stated {by Amoraim}:
Rabbi Yochanan and Rabbi Yehoshua ben Levi -- one said it was established by the Prophets, and one said it was the custom of the Prophets.

{Succah 44b}
And we conclude: Aibo said: I was standing before Rabbi Eleazar bar Tzadok and a cetain person brought a willow before him. He took it and repeatedly shook it without a blessing.
Thus he holds that it was the custom of the Prophets, and on a custom one does not bless.

Rabbi Ami said: The willow requires a basic measure, and it is only taken by itself, and one does not fulfill his obligation with the willow of his lulav.
And Rav Chisda cited Rabbi Yitzchak: One does fulfill his obligation with the willow in the lulav.

And how much is its measure?
Rav Nachman said: Three moist twigs with leaves.
And Rav Sheshet said: Even one leaf on one twig.

{Succah 46a}
The Sages learnt {in a brayta}:
One who assembles a lulav for himself says sheHechiyanu. When he takes it to fulfill with it he says Baruch Ata Hashem ... Asher Kiddeshanu beMitzvotav veTzivanu al netilat lulav {"on the taking of lulav"}. And even though he blessed on the first day of Yom Tov, he repeats the blessing on the second day of Yom Tov. And one who constructs a succah for himself says sheHechiyanu. When he enters to dwell in it he says Baruch Ata Hashem ... Asher Kiddeshanu beMitzvotav veTzivanu leisheiv basuccah {to dwell in the succah"}.

And we conclude that at every hour he enters to dwell therein he blesses leisheiv bassuccah, for we learn it from tefillin. For they learnt {in a brayta}: Tefillin, the entire time he dons them blesses upon them; these are the words of Rabbi. And we establish like him, for Rava, whenever he donned them he blessed. And Rabbi Mari also said that whenever one dons them he blesses upon them. And so is the halacha.

The Sages learnt {in a brayta}: One who constructs a succah for himself says sheHechiyanu. If it was already contructed and is standing, then if he is able to intoduce some novelty to it he { does so and} blesses immediately.