"Also, the number of Mirrors was not fixed."

photo by Trina G. 

"In My previous Dispensation, the matter of successorship was totally obliterated from the Book of God. As all are aware, all that was revealed from the Pen of the All-Merciful was confined to the Letters and the Mirrors of the Bayán. Also, the number of Mirrors was not fixed."

—Bahá’u’lláh

(Additional Tablets and Extracts from Tablets Revealed by Bahá’u’lláh)
www.bahai.org/r/463283651