“The Báb wrote a letter containing three hundred and sixty derivatives of the root Baha” – Baha’u’llah’s name

The Báb announced that the greater Manifestation would take place after Him and called the Promised One "Him Whom God shall make manifest," saying that nine years later the reality of His own mission would become apparent. In His writings He stated that in the ninth year this expected One would be known; in the ninth year they would attain to all glory and felicity; in the ninth year they would advance rapidly. Between Bahá'u'lláh and the Báb there was communication privately. The Báb wrote a letter containing three hundred and sixty derivatives of the root Baha. (‘Abdu’l-Baha, The Promulgation of Universal Peace, p. 24)