DY: That would be difficult as according to most Kol Isha is D’rabannan. If you say like R’ Moshe, it makes sense. You need a Passuk to prove that it’s enough of a Din D’oraisa to be Mevatel Hakol Biksav… Having seen a separation in the past (in Chumash) would only prove that it’s a Middas Chassidus or Eitzah Tovah, not that it’s an absolute Chiyuv (I guess that answer would work if you hold it’s D’Rabannan too).
Menu