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Rabbi Yirmiyah inquired: Does dichui apply to mitzvos or only to korbanos?

 Summary 

 Challenge: Isn’t the answer found in this mishna [and the subsequent discussion]? 

If he covered [the blood] and it was uncovered [by the wind], he need not cover it again. If it was covered by the wind, he must cover it himself.

 Rabbah bar bar Chana: Only if it was uncovered after it was covered by the wind, but as long as it remains covered, he need not cover it.

The question was raised: Why would one be required to cover it after it was uncovered by the wind, it was already nidche when it was covered the first time!

 Rav Papa: We see from here that dichui doesn’t apply to mitzvos. 

 Resolution: Rabbi Yirmiyah’s inquiry was made regarding the strength of Rav Papa’s statement. Was he certain that dichui doesn’t apply to mitzvos even when this results in leniency [such as pronouncing the snipped hadassim kosher (26.5)], or was he uncertain and he therefore said it only when the result was a stringency [to require the covering of blood].

 Suggestion: Perhaps this is already debated by these Tannaim:

 “Rabbi Elazar ben Tzadok: If one transgresses the laws of Yom Tov to remove the berries that grew on his hadassim, it is possul. Chachomim: It is kosher.”

We can say that ‘lulav ein tzarich agad’ [the lulav need not be ‘made’ by tying it together with the hadassim and aravos], but even if it does need to be ‘made’, the ‘taaseh v’lo min ha’asuy’ of sukkos does not apply to lulav as well.

Thus, Rabbi Elazar ben Tzadok holds that dichui applies to mitzvos [and since the hadassim were possul with the advent of yom tov, they can no longer become kosher], while the Chachomim hold that dichui does not apply to mitzvos. 

 Response: No, everyone agrees that dichui does not apply to mitzvos, they argue over whether the ‘taaseh v’lo min ha’asuy’ of sukkos applies to lulav or not.