Menstruation
Concept of ritual uncleanliness during menstruation abolished (though voluntary exemptions from certain spiritual duties are available and for good reason)[edit]
"In some earlier religious Dispensations, women in their courses were considered ritually unclean and were forbidden to observe the duties of prayer and fasting. The concept of ritual uncleanness has been abolished by Bahá'u'lláh (see note 106).
"The Universal House of Justice has clarified that the provisions in the Kitáb-i-Aqdas granting exemptions from certain duties and responsibilities are, as the word indicates, exemptions and not prohibitions. Any believer is, therefore, free to avail himself or herself of an applicable exemption if he or she so wishes. However, the House of Justice counsels that, in deciding whether to do so or not, the believer should use wisdom and realize that Bahá'u'lláh has granted these exemptions for good reason."
- (Notes to the Kitáb-i-Aqdas, no. 20)