[Avodah] Mitsvat Sukkah is almost unique

[Joseph C. Kaplan]

RAF writes concerning whether mikveh should be included in the mitzvot 
encompassing the entire body: "The mitzvah isn't to be in the mikveh, but to 
abstain from certain activities while tamei, and perhaps also to be as tahor 
as can be. The mikveh is the
facilitator, but not the mitzvah itself. KNLAD."

But the woman makes a bracha "asher kidshanu bemitzvotav v'tzivanu al 
hatevilah" implying that it is the tevilah -- that is, the immersion in the 
mikveh -- that is the mitzvah.

Joseph Kaplan