“Prior to our marriage, I was taught that one may open cans on Shabbos, provided one does not reuse the can, whereas my wife was taught that this is strictly forbidden. Since I was taught by someone very knowledgeable and observant, there is something inconsistent here that I would like to understand.”
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In a different article, I explained that one must desecrate Shabbos even if there is only a slight possibility of pikuach nefesh, a life-threatening emergency. One does not need a professional opinion that the situation is dangerous – on the contrary, if a lay person is uncertain whether the situation is dangerous or not, one desecrates Shabbos first and asks questions later (Shu”t Tashbeitz 1:54). Furthermore, the rav of a community and the halachic media are responsible to publicly teach these halachos so that people know them thoroughly. If people ask what to do, it indicates that the rav has been negligent in teaching these halachos (Yerushalmi, Yoma 8:5 and Korban HaEidah ad loc.). To quote Shulchan Aruch (Orach Chayim 328:2): “It is a mitzvah to desecrate Shabbos for a dangerous illness. He who does so swiftly is praised; the person who asks what to do is a shedder of blood!” Shulchan Aruch (Orach Chayim 328:13) reiterates, “Whoever is swift in desecrating Shabbos in a matter that involves danger is praised!
Please note that this rule applies equally on weekdays! If someone is uncertain whether a particular situation is life threatening or not, he/she must immediately seek proper medical attention. Delaying might be bloodshed!
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