The Kitáb-i-Aqdas - The Most Holy Book
Index term: before verse to be said by women in their courses, under Ablutions
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God hath exempted women who are in their courses from obligatory prayer and fasting. Let them, instead, after performance of their ablutions, give praise unto God, repeating ninety-five times between the noon of one day and the next "Glorified be God, the Lord of Splendour and Beauty". Thus hath it been decreed in the Book, if ye be of them that comprehend.
n20.
God hath exempted women who are in their courses from obligatory prayer and fasting.
Exemption from obligatory prayer and fasting is granted to women who are menstruating; they should, instead, perform their ablutions (see note 34) and repeat 95 times a day between one noon and the next, the verse "Glorified be God, the Lord of Splendour and Beauty". This provision has its antecedent in the Arabic Bayán, where a similar dispensation was granted.
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.
The prescribed exemption from obligatory prayer, originally related to the Obligatory Prayer consisting of nine rak'ahs, is now applicable to the three Obligatory Prayers which superseded it.