how we know that the only forbidden relation that becomes permitted is a Brother’s Wife Perek / Halacha: Yevamos 1:1 Oz Vehadar / Artscroll: 2bVilna Shas: 3aAcademy of Hebrew Language: 830Venice / Bomberg: 2c
one who violates Perek / Halacha: Megillah 1:6 Oz Vehadar / Artscroll: 10aVilna Shas: 8bAcademy of Hebrew Language: 747Venice / Bomberg: 71a