[Avodah] Who First Said It? 7 - Mourning during Sefirah

[rabbirichwolpoe at gmail.com]

Plz Post:

The Talmud does record that Talmidei R Akiva perished during Sefirah

However,  AFAIK the Talmud does NOT prescribe any mourning rituals to commemorate this tragedy.

So - Who First Said It?

What is the earliest source for observing Mourning during Sefira?

KT
RRW
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