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We often see that the author of a p'sak maintains that a ruling is d’oraita even in cases when there is no link to any of the 613 mitzvot listed by Rambam, etc. Must every halacha ruled as a d’oraita be able to be traced back to one of the 613 mitzvot?

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Welcome to Mi Yodeya! Could you please edit into your post some examples of such pesakim? That would make this a much stronger question. Please edit your profile to give yourself a name, unless 5551 has some special significance to you! – Isaac Moses Jun 16 '14 at 14:09
See here: judaism.stackexchange.com/questions/28054/… – user4523 Jun 16 '14 at 16:33

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