Mishnah%20in%20talmud for Sukkah 4:3
עֲרָבָה שִׁבְעָה כֵּיצַד, יוֹם שְׁבִיעִי שֶׁל עֲרָבָה שֶׁחָל לִהְיוֹת בְּשַׁבָּת, עֲרָבָה שִׁבְעָה, וּשְׁאָר כָּל הַיָּמִים שִׁשָּׁה:
Aravah — seven. How so? If the seventh day of aravah fell out on Shabbath, aravah — seven. All the other days, six. [The sages made a distinct sign to show that aravah is Torah ordained, i.e., a halachah to Moses on Sinai. In keeping with this, they instituted that on the seventh day, in the Temple, aravah override Sabbath (for they would circle the altar with the aravah.) And today, it is only a custom of the prophets, who had the people take the aravah on the seventh day (Hoshanah Rabbah) aside from the aravah in the lulav (and no blessing is made over it.)]
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