The Mishnah Berurah (215:20) brings from the Chayei Adam (Kelal 5) and Pri Megadim (Pesicha LeHilchos Berachos) that even if there's sfek sfeka (a double doubt) telling you to make a blessing, we don't rely on it to allow you to make a blessing.

In contrast, I heard in a class that there are poskim who hold that if the majority of factories in a country are owned by non Jews, you can rely on rov for tevilas keilim and make a blessing. This includes Rav Moshe (OC 3:4).

Are the opinions who say this by tevilas keilim disagreeing with what the Mishnah Berurah brings? Or is there some distinction I'm unaware of.

I ask because there are those that say (such as Teshuvos HaRashba 1:401) that sfek sfeika works through rov, by looking at the majority of possible outcomes. Not everyone agrees. So would that be the distinction? It might be that the Mishnah Berurah doesn't distinguish, as in the Beur Halacha (60:4 s.v. וכן הלכה) he explains that even though the halacha is mitzvos need kavana (which I'm understanding because of rov, but you could argue), for blessings we still need to be cautious for the (minority) opinions that mitzvos don't need kavana.

  • The Iggerot Moshe's reason seems strange to me. He says that in a case of doubt you don't make a blessing, but if it comes from Europe where most factories belong to non-Jews you can make the blessing. So what's the case of doubt? Don't American factories also mostly belong to non-Jews?
    – b a
    Aug 30, 2019 at 12:25
  • judaism.stackexchange.com/a/89685/759 @ba the case of doubt is where for some reason there is a doubt (mixed it up with a jews dish, whatever). Parush from rov is not a doubt.
    – Double AA
    Aug 30, 2019 at 12:26
  • @robev even rashba doesn't say the mutar opinions are poreish from rov. You're comparing apples and oranges. No one would say not to say a blessing on shechting if you only cut most of the neck
    – Double AA
    Aug 30, 2019 at 13:58
  • Let us continue this discussion in chat.
    – b a
    Aug 30, 2019 at 14:00
  • The mishna berurah is talking about a safek le'halachah and Reb Moshe is talking about a safek metzius?
    – The GRAPKE
    Sep 22, 2020 at 0:58


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