[Avodah] Lo Plog & YT Sheini - 1

[Marty Bluke]

R' Wolpoe asked:
<The Rambam Pasqens that Shavuos has YT sheini for no intrinsic reason
- rather as a Lo Plog. Still looking for Mar'eh Maqom

There is no Makor, it is a simple sevara. Shavuos is not based on a
calendar date, rather it is 49 days after the second day of Pesach.
Since the shluchim went out already on Rosh Chodesh Nisan it gave them
over 2 months to tell everyone. Therefore no one in Galus ever had a
safek when Shavuos was as there was enough time for everyone to find
out. Given that, there was no reason to keep 2 days misafek when they
were mekadesh al pi har'iya. If so the only explanation for 2 days
today is lo plug.

The Chasam Sofer (Orach Chaim Siman 148) has an interesting conclusion
based on this. He claims that since Shavuos was never a safek it is
more chamur then regular Yom Yov Sheni and has the same din as Rosh
Hashana that it is kedusha achas.