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Why don't we apply the rule of ספק דאורייתא לחומרה to techeilet? If there are rabbanim who hold it is the real techelet, and there is compelling evidence that we now know what techeilet is, why doesn't that create enough of a safek for us to be stringent and fulfill this mizva?

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  • Also related: judaism.stackexchange.com/questions/12592/…
    – Dov
    Sep 20, 2023 at 8:14
  • As to this specific point -- that rule only applies if being "machmir" gets you out of the safek! If I'm not sure if I benched at 6pm, and now I bench at 6:15pm, I have definitely benched in the past hour. If I'm not sure if murex is techeles, and now I wear murex ... am I sure I have worn techeles?
    – Shalom
    Sep 20, 2023 at 9:57
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    @Shalom if it is now dusk and I haven't blown shofar, I should blow shofar even though I won't know afterwards if I fulfilled the mitzva or not
    – Double AA
    Sep 20, 2023 at 11:07
  • @Dov the part that mentions my question is an aside in the comments. I don't believe it's a dupe
    – Shababnik
    Sep 20, 2023 at 16:29
  • So you're more specifically asking why don't we apply suffik doraisa lechumrah to techeiles. Are you asking the same way the Radziner was asking about why people weren't convinced of his techeiles, or more specifically to the Murex?
    – robev
    Sep 20, 2023 at 16:57

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