The Kitáb-i-Aqdas - The Most Holy Book
Index term: Mother Book
k103.
Say: This, verily, is the heaven in which the Mother Book is treasured, could ye but comprehend it. He it is Who hath caused the Rock to shout, and the Burning Bush to lift up its voice, upon the Mount rising above the Holy Land, and proclaim: "The Kingdom is God's, the sovereign Lord of all, the All-Powerful, the Loving!"
n129.
the Mother Book
The term "Mother Book" is generally used to designate the central Book of a religious Dispensation. In the Qur'án and Islamic Hadíth, the term is used to describe the Qur'án itself. In the Bábí Dispensation, the Bayán is the Mother Book, and the Kitáb-i-Aqdas is the Mother Book of the Dispensation of Bahá'u'lláh. Further, the Guardian in a letter written on his behalf has stated that this concept can also be used as a "collective term indicating the body of the Teachings revealed by Bahá'u'lláh". This term is also used in a broader sense to signify the Divine Repository of Revelation.