"Many of the laws of the Báb...are carefully designed in a way that testifies that the advent of Him Whom God shall make manifest was impending....The Báb never revealed the words of the (obligatory) prayer itself, thus making the implementation of this law dependent on the arrival of the Promised One." [GH366]

The original Bahá'í obligatory prayer, mentioned in the Kitab-i-Aqdas, involved nine cycles of movement starting with a bow (rak`ah) and was to be said morning, noon, and afternoon. It probably called for three rak`ahs at each time. Bahá'u'lláh revealed the text but did not release it in order to avoid provoking conflict with Muslims. (This prayer was one of the documents in the cases taken by `Abdu'l-Bahá's brothers shortly after the passing of Bahá'u'lláh.) Some time later, after the writing of the Kitab-i-Aqdas but before that of its supplement Questions and Answers, Bahá'u'lláh wrote a second set of obligatory prayers which are in use today. Three alternative forms were provided: a very short prayer to be said between noon and sunset; a somewhat longer prayer to be said in the morning, the afternoon, and the evening; and a long prayer to be said once during twenty-four hours. [Prayer and Worship by John Walbridge]

Jináb-i-Zaynu’l-Muqarrabín was well versed in Islamic jurisprudence. After the revelation of the Kitáb-i-Aqdas, he was authorized to submit questions concerning the laws. The treatise, titled Questions and Answers, an appendix to the Kitáb-i-Aqdas, is a compilation he made of Bahá’u’lláh’s answers to questions concerning the laws of the Most Holy Book. It took more than two decades for "Questions and Answers" to be published in Persian and much longer to be published in English and other languages. [KA9]