The original verses, one for men and one for women, were revealed by The Bab, but in a beautiful passage in the Kitab-i-Aqdas,  KA. 129, The Bab in a fascinating dialogue  with His Best Beloved, Baha'u'llah,  asks that the verse be changed,  because, as The Bab exclaims,  "one single word from Thee excelleth  all that hath been sent down in the Bayan."    

So, in answer to The Bab's request,  Baha'u'llah revealed a new verse,  for both men and women over fifteen years  (the age of maturity).   This verse is inscribed in Arabic.