"For a number of years", Bahá’u’lláh states in one of His Tablets, "petitions reached the Most Holy Presence from various lands begging for the laws of God, but We held back the Pen ere the appointed time had come." Not until twenty years from the birth of His Prophetic Mission in the Síyáh-C̱ẖál of Ṭihrán had elapsed did Bahá’u’lláh reveal the Kitáb-i-Aqdas, the Repository of the laws of His Dispensation. Even after its revelation the Aqdas was withheld by Him for some time before it was sent to the friends in Persia. This divinely purposed delay in the revelation of the basic laws of God for this age, and the subsequent gradual implementation of their provisions, illustrate the principle of progressive revelation which applies even within the ministry of each Prophet. 127. crimson Spot #100 This is a reference to the prison-city of Akká. In the Bahá’í Writings the word "crimson" is used in several allegorical and symbolic senses. (See also note 115.) 128. the Sadratu’l-Muntahá #100 Literally "the furthermost Lote-Tree", translated by Shoghi Effendi as "the Tree beyond which there is no passing". This is used as a symbol in Islám, for example in the accounts of Muḥammad’s Night Journey, to mark the point in the heavens beyond which neither men nor angels can pass in their approach to God, and thus to delimit the bounds of divine knowledge as revealed to mankind. Hence it is often used in the Bahá’í Writings to designate the Manifestation of God Himself. (See also note 164.) 129. the Mother Book #103 The term "Mother Book" is generally used to designate the central Book of a religious Dispensation. In the Qur’án and Islamic Hadíṯẖ, 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. 130. Whoso interpreteth what hath been sent down from the heaven of Revelation, and altereth its evident meaning #105 In several of His Tablets, Bahá’u’lláh affirms the distinction between allegorical verses, which are susceptible to interpretation, and those verses that relate to such subjects as the laws and ordinances, worship and religious observances, whose meanings are evident and which demand compliance on the part of the believers. As explained in notes 145 and 184, Bahá’u’lláh designated ‘Abdu’l-Bahá, His eldest Son, as His Successor and the Interpreter of His Teachings. ‘Abdu’l-Bahá in His turn appointed His eldest grandson, Shoghi Effendi, to succeed Him as interpreter of the holy Writ and Guardian of the Cause. The interpretations of ‘Abdu’l-Bahá and Shoghi Effendi are considered divinely guided and are binding on the Bahá’ís.