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Are there any other “mitzvot” besides counting S’fira that are cumulative? In other words, if you forget a day of S’fira you can no longer count with a bracha. Are there any other types of mitzvot that follow this pattern? For example, if one doesn’t say Kiddush Friday night, you can still say Kiddush on Shabbat morning or the next week. Same for benching. If you don’t wash before a seuda you can still bench and of course not benching once does not preclude you from benching at the next meal.

This question follows the opinion that the entire of sefira is one long mitzvah, not that each day is its own discrete mitzvah. And this is not about a bracha giving me permission to do the next activity or the lack of an activity precluding my making a bracha (if I didn't eat, I don't bentch).

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Also, if you miss lighting candles one night of Chanukah, you still do the rest. –  Monica Cellio May 9 '13 at 14:34
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How about the sequences that various kodshim and taharot procedures require? E.g. You can't eat the Pesach without first slaughtering it and offering it. A metzora' can't bring the final korban until the other steps of purification are complete. –  Isaac Moses May 9 '13 at 16:53
    
@IsaacMoses I thought those are more like I can't wear my Tallit after attaching the tzitzit to one corner if I haven't attached to the other corners. But I agree this is kinda vague. –  Double AA May 9 '13 at 17:32
    
Dan, do you mean in your title 'conditional' or 'cumulative'? –  Double AA May 9 '13 at 17:50

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If a congregation did not read the Parsha (portion) of the Torah one Shabbos they read that Parsha the next Shabbos, but if the Shabbos they didn't read (or the next Shabbos) was a double Parsha or the next Shabbos was a new Chumash (e.g. they didn't read Vayichee) then there is a disagreement whether they should make up for the missed Parshiyos. See SA OC 135:2 and Mishnah Berurah #7.

Another Mitzvah would be Nezirus - if the Nazir became Tomei Meis he did not fulfill his Nezirus days and he has to start counting all over again.

Also Shofar blowing, if one messed up during Tekios (let's say he did Tekiah Teruah Shivorim) he had to go back to the beginning of that Tekiah.

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but by both nezirus and shofar, one can go back and start again. By sefirah, you can't. –  Danno May 10 '13 at 13:09
    
That is because by Sefirah one can't physically bring that day back (because it depends on 2nd day of Pesach), for Shofar that would be equal to one who made those errors immediately before Yom Tov went out - so he can't make up for them any more. For a Nezirus there is also such an example if he turned 120 (euphemism) before he managed to restart the Nezirus. In both cases the shofar sounds that he did blow and the original days that he kept as a Nazir are not counted even as part of a full Mitzvah (maybe for the Nazir there's some reward for those days he kept Kehalacha but by Shofar, no –  Meir Zirkind May 10 '13 at 15:32

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