Nabil-i-Akbar [who was later named by the Guardian as one of the 19 Apostles of Baha’u’llah] was acknowledged as one of the most outstanding men of learning in Persia. His fame had spread throughout the country to such an extent that once, when he spoke incognito to a number of divines in far-off [city of] Kirman, his listeners were lost in admiration of his superb discourse and some were heard to say that the only person in the whole country who could rival such a man in the field of learning and knowledge would be the famous Mulla Muhammad-i-Qa'ini (that is, Nabil-i-Akbar himself).
He embraced the Bábí Faith about the year 1853. Some six years later [about 1859], while in Baghdad, he went to visit Bahá'u'lláh. [this is before Baha’u’llah’s Declaration in the Garden of Ridvan in 1863] There he was warmly received by Him, and was accorded the honour of staying in the outer apartments of His house, normally reserved for the reception of visitors. Mirza Aqa Jan [Baha’u’llah’s amanuensis] was instructed by Bahá'u'lláh to act as host to him. The following is an extract from the spoken chronicle of Nabil-i-Akbar relating the events of those few days that he spent in the house of Bahá'u'lláh: