I have heard that if a knife is used (even for pretend) to threaten someone it is treif to use unless Neitza is done to it (being stabbed in the ground 10 times). Does anybody know of a source for this?

  • Perhaps they’re further embellishments on R. Yehuda HaChassid’s warning (Additions, no. 6), which may have origins in a beraita in San. (45b). – Oliver Jan 25 '19 at 6:26
  • דברים שבלב אינו דברים – Rafael Mar 11 '19 at 2:30
  • I heard that such a knife is forever forbidden to be used for Shechita. – Double AA Mar 11 '19 at 2:55
  • @Rafael it's not דברים שבלב because he is physically threatening just not completing the act. – mmc99 Mar 11 '19 at 3:03
  • Sounds made up to me – sam Mar 11 '19 at 15:34

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