[Avodah] Ruth on Shavuot

[Saul Mashbaum]

Rmenucha asked
>>
Where is the primary source stating that a reason that Ruth is read on
Shavuot is because of her giyur, and Matan Torah like giyur (or
something like that?)
>>

Sefer HaTodaah Vol II p 78 cites the Abudraham p 240 . "[We read Ruth
on Shavuot] because our fathers received the Torah and entered the
covenant through milah and t'villa, as is the law by converts.  [We
read Ruth on Shavuot] in honor of Ruth who was a convert and became
the mother of royalty; we say to her, as it were, "we all were
converts then" "

Saul Mashbaum