Tuvya Marcus asks:
Why Rashi? Mashma from the Gemara l'Ikuva and Rashi says it's difficult that it's required but rather for a Mitzvah
Tosefos talks about this too.but learns it is Me'akev?
Tuvya Marcus, Jerusalem Israel
The Kollel replies:
Dear R' Marcus,
Good point you are raising. Rashi was aware of one Girsa which says that it is indispensable that the Musafim of Shabbos must be alike. But he rejects that first Girsa, and instead favors a second Girsa that says it is only a Mitzvah that the two should be alike. This is unlike Tosfos who defends that first Girsa.
I hope this helps.
Best wishes,
Yishai Rasowsky