Quickly review “גמרא דף מד. “איתמר ר’ יוחנן וריב”ל (eleven lines from bottom of the Amud)
Learn “גמרא תמורה דף טז. “גופא אמר רב יהודה (three lines from top of the Amud until the wide lines)
https://hebrewbooks.org/shas.aspx?mesechta=34&daf=16&format=pdf
Question:
How could ר’ אבהו answer the contradiction of whether Aravah is a יסוד נביאים or הלכה למשה מסיני when the Gemara Temura clearly says one can not ask through prophecy to be taught forgotten halachos?
See ערוך לנר סוכה דף מד. “וחזרו
https://hebrewbooks.org/pdfpager.aspx?req=14414&st=&pgnum=171
Learn חידושי גרי”ז על יומא page 26-27 who says a novel difference between a הלכה למשה מסיני and one that was forgotten and restored by עתניאל בן קנז or other Chachamim
Learn חידושי גרי”ז תמורה טז אות ב who explains a difference between תורה לאו בשמים and אין הנביא רשאי לחדש דבר
Note: The difference between יסוד and מנהג נביאים that Rashi gives.
The Gemara concludes כאן במקדש כאן בגבולין
See how Rashi explains this answer
According to Rashi the נביאים set up the taking of Aravos outside the Beis Hamikdash.
Was this for all seven days of Sukkos or just the last day – Hoshana Rabbah?
Major Question:
The Gemara on מד says that the taking of Aravos on Hoshana Rabbah is זכר למקדש.
But the gemara now says it was a either a יסוד and מנהג נביאים?
See רבינו חננאל (on side of the Gemara) for a different explanation than Rashi
Learn רמב״ם הלכות לולב פרק ז הלכה כא-כב and מגיד משנה
https://hebrewbooks.org/pdfpager.aspx?req=14278&st=&pgnum=287
Major Question:
The Rambam says the mitzvah of Aravah we take on Hoshana Rabbah is both זכר למקדש and מנהג נביאים.
How could it be both?
What compelled the Rambam to give this explanation?
The Rambam seems to offer an entirely new reason than the גמרא מד as to why the mitzvah of Aravah is only one day זכר למקדש?
Learn ערוך לנר for an explanation for the Rambam
https://hebrewbooks.org/pdfpager.aspx?req=14414&st=&pgnum=171
Can we offer a different explanation for the Rambam based on the conclusion of the Gemara of כאן במקדש כאן בגבולין?
According to אבא שאול the mitzvah of Aravah in the Beis Hamikdash is learnt from the words ערבי נחל
Learn “תוספות דף לד. “ואחת who asks where in the pasuk is it indicated that it’s limited to Beis Hamikdash?
See תוספות ראש
https://hebrewbooks.org/pdfpager.aspx?req=14724&st=&pgnum=60
And ערוך לנר
https://hebrewbooks.org/pdfpager.aspx?req=14414&st=&pgnum=125