The Chazon Ish says that someone who bites his nails cannot be an eider kedushin because its probable that he is Michalel Shabbos.(I think it was the Chazon Ish who said that, I satnd to be corrected)
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The Chazon Ish says that someone who bites his nails cannot be an eider kedushin because its probable that he is Michalel Shabbos.(I think it was the Chazon Ish who said that, I satnd to be corrected)