[Avodah] U'Lechaparat Pesha - In Mussaf Rosh Chodesh

[Galsaba at aol.com]

I am trying to find the source of saying "U'Lechaparat Pesha" in Musaf Rosh 
Chodesh in a Leap year.
Also, I wonder why we say it only on Rosh Chodesh Chesvan to Nissan, and not 
every Rosh Chodesh for the entire year.
 
Thanks,
 
galsaba



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