The Kitáb-i-Aqdas - The Most Holy Book
Index term: relationship to Kitáb-i-Aqdas, under Bayán
k142.
Verily, He [The Báb] revealed certain laws so that, in this Dispensation, the Pen of the Most High might have no need to move in aught but the glorification of His own transcendent Station and His most effulgent Beauty. Since, however, We have wished to evidence Our bounty unto you, We have, through the power of truth, set forth these laws with clarity and mitigated what We desire you to observe. He, verily, is the Munificent, the Generous.
n108.
the Bayán
The Bayán, the Mother Book of the Bábí­ Dispensation, is the title given by the Báb to His Book of Laws, and it is also applied to the entire body of His Writings. The Persian Bayán is the major doctrinal work and principal repository of the laws ordained by the Báb. The Arabic Bayán is parallel in content but smaller and less weighty. When describing the Persian Bayán in God Passes By Shoghi Effendi indicated that it should be regarded "primarily as a eulogy of the Promised One rather than as a code of laws and ordinances designed to be a permanent guide to future generations".
‘Abdu’l-Bahá has written: “The Bayán hath been superseded by the Kitáb-i-Aqdas, except in respect of such laws as have been confirmed and mentioned in the Kitáb-i-Aqdas.”
n109.
the destruction of books
In the Tablet of Ishráqát Bahá’u’lláh, referring to the fact that the Báb had made the laws of the Bayán subject to His sanction, states that He put some of the Báb’s laws into effect “by embodying them in the Kitáb-i-Aqdas in different words”, while others He set aside.
With regard to the destruction of books, the Bayán commanded the Báb’s followers to destroy all books except those that were written in vindication of the Cause and Religion of God. Bahá’u’lláh abrogates this specific law of the Bayán.
As to the nature and severity of the laws of the Bayán, Shoghi Effendi in a letter written on his behalf provides the following comment:

The severe laws and injunctions revealed by the Báb can be properly appreciated and understood only when interpreted in the light of His own statements regarding the nature, purpose and character of His own Dispensation. As these statements clearly reveal, the Bábí­ Dispensation was essentially in the nature of a religious and indeed social revolution, and its duration had therefore to be short, but full of tragic events, of sweeping and drastic reforms. Those drastic measures enforced by the Báb and His followers were taken with the view of undermining the very foundations of Shí­'ih orthodoxy, and thus paving the way for the coming of Bahá’u’lláh. To assert the independence of the new Dispensation, and to prepare also the ground for the approaching Revelation of Bahá’u’lláh, the Báb had therefore to reveal very severe laws, even though most of them were never enforced. But the mere fact that He revealed them was in itself a proof of the independent character of His Dispensation and was sufficient to create such widespread agitation, and excite such opposition on the part of the clergy that led them to cause His eventual martyrdom.
n189.
this new World Order
In the Persian Bayán, the Báb stated: “Well is it with him who fixeth his gaze upon the Order of Bahá’u’lláh, and rendereth thanks unto his Lord. For He will assuredly be made manifest. God hath indeed irrevocably ordained it in the Bayán.” Shoghi Effendi identifies this “Order” with the System Bahá’u’lláh envisages in the Aqdas, in which He testifies to its revolutionizing effect on the life of humanity and reveals the laws and principles which govern its operation.
The features of the “new World Order” are delineated in the Writings of Bahá’u’lláh and ‘Abdu’l-Bahá and in the letters of Shoghi Effendi and the Universal House of Justice. The institutions of the present-day Bahá’í­ Administrative Order, which constitute the "structural basis" of Bahá’u’lláh’s World Order, will mature and evolve into the Bahá’í­ World Commonwealth. In this regard, Shoghi Effendi affirms that the Administrative Order "will, as its component parts, its organic institutions, begin to function with efficiency and vigour, assert its claim and demonstrate its capacity to be regarded not only as the nucleus but the very pattern of the New World Order destined to embrace in the fullness of time the whole of mankind".
For additional information on the evolution of this new World Order, see, for example, the letters of Shoghi Effendi published in The World Order of Bahá’u’lláh.