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Jewish sources discuss whether tzitzis strings should be cut with metal implements like scissors, based on the principle that iron shortens life while tzitzis—which contain a commandment—lengthen it. Sources range from Talmudic precedent about the altar to later rabbinic codes that debate whether this is a strict prohibition or a customary stringency.
הַבַּרְזֶל פּוֹסֵל בִּנְגִיעָה
