Mullá Husayn sent a report to Siyyid Kázim concerning his success in Isfahan

Having fulfilled the first part of his mission, Mullá Husayn despatched this written testimony of Hájí Siyyid Muhammad-Báqir to his master in Karbilá, and directed his steps towards Mashhad, determined to deliver, to the best of his ability the message which he was charged to give to Mírzá Askarí.

Immediately the letter, enclosing the Siyyid’s written declaration, was delivered to Siyyid Kázim, the latter was so rejoiced that he forthwith sent to Mullá Husayn his reply, expressing his grateful appreciation of the exemplary manner in which he had discharged his trust. He was so delighted with the answer he had received that, interrupting the course of his lecture, he read out, to his disciples, both the letter of Mullá Husayn and the written testimony enclosed in that letter. He afterwards shared with them the epistle which he himself had written to Mullá Husayn in recognition of the remarkable service he had rendered him. In it Siyyid Kázim paid such a glowing tribute to his high attainments, to his ability and character that a few among those who heard it suspected that Mullá Husayn was that promised One to whom their master unceasingly referred, the One whom he so often declared to be living in their very midst and yet to have remained unrecognised by them all.

That communication enjoined upon Mullá Husayn the fear of God, urged him to regard it as the most potent instrument with which to withstand the onslaught of the enemy, and the distinguishing feature of every true follower of the Faith. It was couched in such terms of tender affection, that no one who read it could doubt that the writer was bidding farewell to his beloved disciple, and that he entertained no hope of ever meeting him again in this world. 

(Chapter 2, ‘The Dawn-Breakers’)