The Christian governor of Isfahán embraced Islam as a result of a “dissertation” that the Báb revealed at his request before “a brilliant assemblage of the most accomplished divines”

The wise and judicious Manuchihr Khán could not resist the temptation of visiting so strange, so intriguing a Personage. Before a brilliant assemblage of the most accomplished divines he, a Georgian by origin and a Christian by birth, requested the Báb to expound and demonstrate the truth of Muhammad’s specific mission. To this request, which those present had felt compelled to decline, the Báb readily responded. In less than two hours, and in the space of fifty pages, He had not only revealed a minute, a vigorous and original dissertation on this noble theme, but had also linked it with both the coming of the Qá’im and the return of the Imám Husayn—an exposition that prompted Manuchihr Khán to declare before that gathering his faith in the Prophet of Islám, as well as his recognition of the supernatural gifts with which the Author of so convincing a treatise was endowed. 

- Shoghi Effendi  (Chapter 1, ‘God Passes By’)

The enthusiastic people of Isfahán wanted to see the Báb

The tumultuous enthusiasm of the people of Isfahán was meanwhile visibly increasing. Crowds of people, some impelled by curiosity, others eager to discover the truth, still others anxious to be healed of their infirmities, flocked from every quarter of the city to the house of the Imám-Jum‘ih. 

- Shoghi Effendi  (Chapter 1, ‘God Passes By’)

The Báb revealed a commentary on a surih of the Qur’an at the request of the Imám-Jum‘ih of Isfahán

It was at the request of this same prelate [the Imám-Jum‘ih of Isfahán] that the Báb, one night, after supper, revealed His well-known commentary on the súrih of Va’l-‘Asr. Writing with astonishing rapidity, He, in a few hours, had devoted to the exposition of the significance of only the first letter of that súrih—a letter which Shaykh Ahmad-i-Ahsá’í had stressed, and which Bahá’u’lláh refers to in the Kitáb-i-Aqdas—verses that equalled in number a third of the Qur’án, a feat that called forth such an outburst of reverent astonishment from those who witnessed it that they arose and kissed the hem of His robe. 

- Shoghi Effendi  (Chapter 1, ‘God Passes By’)

The Báb’s effect on His host, the Imám-Jum‘ih of Isfahán

So magic was His charm that His host, forgetful of the dignity of his high rank, was wont to wait personally upon Him. 

- Shoghi Effendi  (Chapter 1, ‘God Passes By’)

The Báb’s effect on the people of Isfahán

…such was the spell He [the Báb] cast over the people of that city that, on one occasion, after His return from the public bath, an eager multitude clamored for the water that had been used for His ablutions. 

- Shoghi Effendi  (Chapter 1, ‘God Passes By’)

The Báb was a guest of the Imám-Jum‘ih of Isfahán for 40 days

The first forty days of His sojourn in Isfahán were spent as the guest of Mírzá Siyyid Muhammad, the Sulṭanu’l-‘Ulamá, the Imám-Jum‘ih, one of the principal ecclesiastical dignitaries of the realm, in accordance with the instructions of the governor of the city, Manuchihr Khán, the Mu ‘Tamidu’d-Dawlih, who had received from the Báb a letter requesting him to appoint the place where He should dwell. He was ceremoniously received… 

- Shoghi Effendi  (Chapter 1, ‘God Passes By’)

September 1846: The Báb left Shiraz and proceeded to Isfahán

Miraculously preserved by an almighty and watchful Providence, the Báb proceeded to Isfahán (September, 1846), accompanied by Siyyid Kázim-i-Zanjání. Another lull ensued, a brief period of comparative tranquillity during which the Divine processes which had been set in motion gathered further momentum, precipitating a series of events leading to the imprisonment of the Báb in the fortresses of Máh-Kú and Chihríq, and culminating in His martyrdom in the barrack-square of Tabríz. 

- Shoghi Effendi  (Chapter 1, ‘God Passes By’)