I was listening to a lecture in my synagogue in which it was mentioned ( correctly or incorrectly - I don't know ) that a הלכה למשה מסיני - Halach to Moses from Sinai is a law that has never been ...
Rabbi Isaac Alfasi's summary of tractate Niddah is hidden in masechet Shevuot. Why is it buried in maseches Shevuos?
Where inside tractate Nidda can I find R' Isaac Alfasi's commentary on the tractate? I looked in hebrewbooks.org's 685-page tractate-Niddah PDF but couldn't find it.