Learn the “גמרא מג: “איתיביה אביי (middle of the Amud) until “דף מד. “א”ל אביי (seven lines from the top of the Amud)
Questions:
What changed after the destruction of the beis hamikdash that created an issue of people in chutz laaretz doing things differently than the Jews in Eretz Yisrael?
Rashi “מד. “לדידהו says this is an issue of לא תתגודדו but the Gemara Yevomas clearly states that לא תתגודדו is only an issue when there are different practices in one city?
Learn “תוספת מג: “והביאו
Learn תוספת דף לד. “ואחת
Questions:
Why does there need to be a uniform practice both in chutz laaretz and Eretz Yisrael?
Learn “רש”י דף מד. “לדידהו who explains because the prohibition of לא תתגודדו – having groups performing mitzvos differently as it gives the appearance of two religions.
The גמרא יבמות דף יג:-יד states that לא תתגודדו is only an issue according to אביי when there are different practices in one city and according to רבא even in one city it is acceptable if there are two different ruling courts (שתי בתי דין) which explains how on Purim there are different days for reading the Megillah (see תוספת שם “כי & רא”ש ס’ ט)
So how could Rashi say there is an issue of לא תתגודדו to have chutz laaretz have different practice than Eretz Yisrael when they are two different regions?
According to the Gemara, only after the destruction of the Beis Hamikdash did they institute a universal rule regarding taking Hoshanos on Hashanah Rabbah that coincides with Shabbos.
During the time of the Beis Hamikdash why was this not an issue of לא תתגודדו?
What changed after the destruction of the beis hamikdash that created an issue of people in chutz laaretz doing things differently than the Jews in Eretz Yisrael?
See מאירי דף מג. ” ושאל בה איננו דיי בקיבועא דירחא
https://hebrewbooks.org/pdfpager.aspx?req=57966&st=&pgnum=116
Why isn’t the keeping of a second day of Yom tov in chutz laaretz an issue of לא תתגודדו?