What follows is my provisional translation (in other words, not official or authorized; see here for more) of a Persian letter written on Shoghi Effendi’s behalf by Núru’d-Dín Zayn (the son of Zaynu’l-Muqarrabín). The letter is dated 27 August 1933 and addressed to Sarkháb Bás Áftábí, who was then serving as chairman of the Local Spiritual Assembly of the Baháʼís of Bombay. The original text can be found in Ganjíniy-i-Ḥudúd va Aḥkám, p. 425.
Concerning the recitation of the Tablet of Visitation, he [the Guardian] has instructed me to write that this applies only to the Báb and Baháʼuʼlláh. It is incumbent upon the friends to gather on both of the nights of Ascension [meaning Baháʼuʼlláh’s and ʻAbduʼl-Bahá’s]; indeed, it is mandatory that they do so. This obligation, however, does not apply to the night of the Ascension of the Greatest Holy Leaf.
A typed version of the complete Persian text of this letter appears below.