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If I’m not mistaken, I read about such a mitzvah in Mesechet Taanit, but then I couldn’t find it and now it’s annoying me. Though, I could have also simply seen it somewhere else. So does anyone know the answer?

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  • Maybe you're thinking of planting carob trees?
    – Double AA
    Jan 31 '21 at 22:07
  • Idk I don’t think it was that. Is it possible that the mitzvah is Tzedkah/Maaser? Jan 31 '21 at 22:08
  • @CuriousYid -You are probably thinking of someone who answers " amen y'hey shmei rabbah etc. to kaddish with all his might can tear up a decree of 70 years." Jan 31 '21 at 23:28
  • @DavidKenner Yes I think you’re right. Thanks! Jan 31 '21 at 23:58
  • @CuriousYid Yes, but - I don't know if it means what you said in your title!
    – MichoelR
    Feb 1 '21 at 0:44
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This is perhaps a bit more general than you want, but Rabbenu Yonah, in his definitive treatise on repentance (שערי תשובה – Shaarei Teshuvah) details twenty steps towards a full repentance, the tenth of which is:

Act in a manner contrary to the sin.

Indeed, the Midrash says:

If you have done piles of sins, do piles and piles of commandments that correspond to them. [Leviticus Rabbah 21:5]

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    I don't think that is what the OP is after. He specifically wants something that knocks off a sin from 70 years prior.
    – Dov
    Feb 1 '21 at 15:55
  • @Dov yes, unless I’m crazy (which I don’t think I am), I’m sure there was a mitzvah and it was singled out in the teaching that it can absolve a sin from 70 years. It’s been bothering me for months now Feb 1 '21 at 23:23

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