As a further testimony to the greatness of the Revelation identified with Bahá’u’lláh may be cited the following extracts from a Tablet addressed by ‘Abdu’l-Bahá to an eminent Zoroastrian follower of the Faith: “Thou hadst written that in the sacred books of the followers of Zoroaster it is written that in the latter days, in three separate Dispensations, the sun must needs be brought to a standstill. In the first Dispensation, it is predicted, the sun will remain motionless for ten days; in the second for twice that time; in the third for no less than one whole month. The interpretation of this prophecy is this: the first Dispensation to which it refers is the Muḥammadan Dispensation during which the Sun of Truth stood still for ten days. Each day is reckoned as one century. The Muḥammadan Dispensation must have, therefore, lasted no less than one thousand years, which is precisely the period that has elapsed from the setting of the Star of the Imamate to the advent of the Dispensation proclaimed by the Báb. The second Dispensation referred to in this prophecy is the one inaugurated by the Báb Himself, which began in the year 1260 A.H. and was brought to a close in the year 1280 A.H. As to the third Dispensation—the Revelation proclaimed by Bahá’u’lláh—inasmuch as the Sun of Truth when attaining that station shineth in the plenitude of its meridian splendor its duration hath been fixed for a period of one whole month, which is the maximum time taken by the sun to pass through a sign of the Zodiac. From this thou canst imagine the magnitude of the Bahá’í cycle—a cycle that must extend over a period of at least five hundred thousand years.” From the text of this explicit and authoritative interpretation of so ancient a prophecy it is evident how necessary it is for every faithful follower of the Faith to accept the divine origin and uphold the independent status of the Muḥammadan Dispensation. The validity of the Imamate is, moreover, implicitly recognized in these same passages—that divinely-appointed institution of whose most distinguished member the Báb Himself was a lineal descendant, and which continued for a period of no less than two hundred and sixty years to be the chosen recipient of the guidance of the Almighty and the repository of one of the two most precious legacies of Islám.