Rif Succah 21b {Succah 43a continues; 42b}

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21b

{Succah 43a continues}
And the first day that it has a foundation in the Torah in the gevulin, from where?
For they learnt {in a brayta}:
{Vayikra 23:40

מ וּלְקַחְתֶּם לָכֶם בַּיּוֹם הָרִאשׁוֹן, פְּרִי עֵץ הָדָר כַּפֹּת תְּמָרִים, וַעֲנַף עֵץ-עָבֹת, וְעַרְבֵי-נָחַל; וּשְׂמַחְתֶּם, לִפְנֵי יְהוָה אֱלֹהֵיכֶם--שִׁבְעַת יָמִים.

40 And ye shall take you on the first day the fruit of goodly trees, branches of palm-trees, and boughs of thick trees, and willows of the brook, and ye shall rejoice before the LORD your God seven days.

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וּלְקַחְתֶּם -- that there should be a taking for each individual.
לָכֶם -- that it should be theirs - to exclude the stolen and the borrowed.
בַּיּוֹם -- even on Shabbat
רִאשׁוֹן - and even in the gevulin
הָרִאשׁוֹן - {with the definite article, thus implying specifically this} that it only pushes off on the first day of Yom Tov.

Mar said {immediately above}, " even on Shabbat."
This is obvious! It is mere moving! Do we need a verse to permit moving?

Rava said: The verse was only needed to permit moving of the accoutrements of lulav, and according to Rabbi Eliezer.
For they learnt {in a brayta}: The lulav and all its accoutrements push off Shabbat. These are the words of Rabbi Eliezer.
What is the reason of Rabbi Eliezer? The verse states בַּיּוֹם -- even on Shabbat. And the Sages maintain בַּיּוֹם -- and not during the night.

{Succah 42b}
Mishna:
The willow, seven, how so?
The seventh day of the willow which falls out on Shabbat, the willow, seven.
And {if it falls out} on any other day {of the week}, six.