The Kitáb-i-Aqdas - The Most Holy Book
Index term: and pilgrimage, under Travel
n55.
and from this He hath exempted women as a mercy on His part
In the Bayán, the Báb enjoined the ordinance of pilgrimage once in a lifetime upon those of His followers who were financially able to undertake the journey. He stated that the obligation was not binding on women in order to spare them the rigours of travel.
Bahá'u'lláh likewise exempts women from His pilgrimage requirements. The Universal House of Justice has clarified that this exemption is not a prohibition, and that women are free to perform the pilgrimage.