[Avodah] Who First Said It? 8 - Lechem Mishnah On YT

[rabbirichwolpoe at gmail.com]

Given:
The Talmud states that lechem mishnah is required on shabbos
What source first  extended this to Yom Tov also?

L'mai Nafqa Minah?
Perhaps how one approaches 3 vs. 2 Matzos at the Seder.

Hint:
See BeHag.

GS
RRW
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