Exlakewooder, it says in the parsha of arayos:”velo sikarvu legalos erva…”. This is the mekor. A pnuya, who became a nidda de’oraisa (when and how is a different shmuz), is an erva. Shulchan aruch paskens that all lavin of the 3 chamuros are yehareg ve’lo’yaavor.
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