The Gemara (Shabbat 49a) says that tefillin must only be worn with a "guf naki" (clean body) which is defined by Abaye and Rava respectively as flatulence and sleeping. Other Rishonim, like the Maharam (Orchot Chayyim I Tefillin 3), and Achronim like Arukh Hashulchan (OC 38:6), and Chatam Sofer (Shabbat 49a) likewise include improper thoughts as a disqualification.

My question is, does anyone know of any responsa, psak, or halakha (with preference for more modern ones) that addresses situations that clarify the requirement of "guf naki" for men? Does anyone clarify if it is dirt, blood, or lack of bathing (weekly? monthy? less than standard?) that would qualify as non-"naki?" For example, does any posek deal with wearing tefillin on a camping trip when showering is infrequent and good hygiene is difficult? Or about wearing tefillin after a red-eye flight or all-nighter?

  • [Back then most people didn't have the opportunity to take shower each day.] – Kazi bácsi Dec 29 '20 at 8:13
  • The satmar rebbe was against putting on t'fillin to non orthodox for this reason and wrote about it. – interested Dec 29 '20 at 9:24
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    I've never seen hygiene in the rules for guf naki. – N.T. Dec 29 '20 at 11:22
  • @N.T. See these related posts. judaism.stackexchange.com/q/61862/11105, judaism.stackexchange.com/q/61852/11105 – SophArch Dec 29 '20 at 12:46
  • @Kazibácsi See here (torahmusings.com/2014/02/…) around notes 19-21 for sources that say that tefillin was a neglected mitzvah. my question is what, specifically, the concern was. It doesn't seem to be have dirt on you. Nobody mentions blood specifically. Nobody mentions a required shower frequency. etc. – SophArch Dec 29 '20 at 15:25

The answer is no. Those are not mentioned as problems for guf naki. It is not related to hygiene.

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    @NT - this is a comment not an answer. For it to be an answer you would need to substantiate your claim with a source. – Dov Dec 30 '20 at 9:55
  • @dov There is no source to quote. The point is, guf naki and hygiene are not connected in any source. – N.T. Dec 30 '20 at 12:56
  • I mean, there are a bunch of sources that say women could have a guf naki if they were conscientious. What do you think they mean by the term? – SophArch Dec 30 '20 at 13:38
  • The same thing as for men, mainly flatulence and improper thoughts. – N.T. Dec 31 '20 at 21:29
  • So bring the source saying what the meaning of guf naki is, and you will have demonstrated (if not 100% conclusively) what it is not. – Mordechai Dec 31 '20 at 23:45

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