@paarsurrey Maybe this will help:
"That city is none other than the Word of God revealed in every age and dispensation. In the days of Moses it was the Pentateuch; in the days of Jesus the Gospel; in the days of Muhammad the Messenger of God the Qur'án; in this day the Bayan; and in the dispensation of Him Whom God will make manifest His own Book -- the Book unto which all the Books of former Dispensations must needs be referred, the Book which standeth amongst them all transcendent and supreme."
(Baha'u'llah, The Kitab-i-Iqan, p. 199)
"Unique and stupendous as was this Proclamation, it proved to be but a prelude to a still mightier revelation of the creative power of its Author, and to what may well rank as the most signal act of His ministry -- the promulgation of the Kitáb-i-Aqdas. Alluded to in the Kitáb-i-Íqán; the principal repository of that Law which the Prophet Isaiah had anticipated, and which the writer of the Apocalypse had described as the "new heaven" and the "new earth," as "the Tabernacle of God," as the "Holy City," as the "Bride," the "New Jerusalem coming down from God," this "Most Holy Book," whose provisions must remain inviolate for no less than a thousand years, and whose system will embrace the entire planet, may well be regarded as the brightest emanation of the mind of Bahá'u'lláh, as the Mother Book of His Dispensation, and the Charter of His New World Order.
(Shoghi Effendi, God Passes By, p. 213)
