Pesik reisha
Appearance
In Halacha (Jewish law) a reisha (Lit. cutting off the head) is an action that ordinarily would be permitted but which will definitely cause an unintended prohibited side effect. A classic case of a reisha found in the Talmud[1] is opening a door next to a candle on Shabbos (the Jewish Sabbath) where the candle will definitely be blown out.
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