[Avodah] eating matza for 7 days

[Eli Turkel]

I think the disconnect is in your identefication of mitzvas asei
with chiyuv. Most hold that the rest of Pesach only holds an issur of
chameitz. The Gra (daas yachid?) holds there is a qiyum asei in eating
matzah. Qiyumis, not chiyuvis.>>

No the Gra is not a daas yachid before him there is the chizkuni (shemot 12:18)
see
http://www.vbm-torah.org/pesach/pesach65-rbt.htm
for more details

As an aside this halacha comes up in an entirely different context.
RMF claims that the mitzva of yishuv ha-aretz is a mitzva kiyumit.
R. Avrahaam Shapira disagreed and said that a mitza kiyumit is like tzizit
where the choice is whether to wear a 4 cornered garment or not. However, once
one wears a 4 cornered garment one is required to wear tzizit.
He claimed that there were no examples of a mitzva kiyumit where one
had complete
freedom whether to keep the mitzva or not.
I felt that one counter-example is this halacha of eating matza all 7
days according to
the Chizkuni/Gra. I once had another example which I can't currently remember.

For those keeping a second day of yomtov - enjoy -). We have Maimouna


-- 
Eli Turkel