[Avodah] Purim on the 13th

[Micha Berger]

On Y-mi Megillah 1a, there is a machloqes amoraim whether reading on the
11th and 12th was from AKHG, or if AKHG only left reshus that a later
generation utilized to allow it. The 13th was added later either way,
on the grounds that it was sandwiched in. (Which doesn't sit well with
me, but that's my problem.)

Could we suggest that in AKHG's cheshbon (as in ours), Purim never fell
out on Wed or on Shabbos, and therefor they didn't have a need to permit
reading on the 13th?

Given the level of observance among the olim miBavel, it would make
sense that AKHG would try to implement lo Adu rosh or another rule
that minimized chillul Shabbos. As RRW noted in the past, YT sheini
shel galiyos doesn't fit lo BeD"U Pesach except a safeiq of Shabbos
vs. Sunday -- there are no other pairs of adjacent days possible for
Pesach. So even if this hypothetical rule was in place during early Bayis
Sheini, it was apparently not in force between then and some time after
Abayei. Including when our mishnah was written.

Then, with the loss of the Sanhedrin, we were at a point of needing
to avoid tempting people into chillul Shabbos again, and the lo AD"U
and lo BeD"U rules were revived.

Tir'u baTov!
-Micha

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