Reference for Sukkah 65:15

מאן תנא להא דת"ר לולב מצוה לאוגדו ואם לא אגדו כשר מני אי רבי יהודה כי לא אגדו אמאי כשר אי רבנן מאי מצוה קא עביד לעולם רבנן ומצוה משום (שמות טו, ב) זה אלי ואנוהו:

Who is it that taught that which our Rabbis have taught: It is a mitzvah to bind the lulav, but [even] if he did not bind it, it is valid? Now who is it? ? If it is R. Judah, why is it valid if he did not bind it? If it is the rabbis, then what mitzvah did he perform? It is in fact the rabbis, and it is a mitzvah because of "This is my God and I will glorify Him."

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