Related for Sukkah 4:1
לוּלָב וַעֲרָבָה, שִׁשָּׁה וְשִׁבְעָה. הַהַלֵּל וְהַשִּׂמְחָה, שְׁמֹנָה. סֻכָּה וְנִסּוּךְ הַמַּיִם, שִׁבְעָה. וְהֶחָלִיל, חֲמִשָּׁה וְשִׁשָּׁה:
Lulav [the taking of the lulav] and aravah [for the circling of the altar] — (sometimes the mitzvah is) six (days) and (sometimes) seven. [Sometimes it overrides the Sabbath and is seven days; and sometimes it does not override the Sabbath and is six (to be explained later)]. Hallel and rejoicing are eight. [(Hallel:) to complete the Hallel all eight days (as opposed to Pesach), for the days of the festival (of Succoth) are distinct in their offerings. (rejoicing:) to eat the flesh of peace-offerings at the time of the Temple, it being written (Deuteronomy 16:14): "And you shall rejoice in your festival," and there is no rejoicing at the time of the Temple except with peace-offerings, viz. (Ibid. 27:7): "and you shall slaughter peace-offerings, and you shall eat them there, and you shall rejoice."] Succah [sitting in the succah] and the water libation [at the morning temidim of the festival] — seven. And the chalil (the flute), five and six. [At the simchath Beth Hashoeva, they rejoiced in the festival in honor of the drawing of the water for the libations, and they would play on flutes and viols. And that chalil overrides neither Sabbath nor festival.]