One day, in 1840, Siyyid Káẓim again repeated the question to his students: ‘Will someone arise and take this Message to Ḥájí Siyyid Muḥammad Báqir in Iṣfahán?’ Still, nobody offered to go, except a man whom Siyyid Káẓim did not consider intelligent enough to do it properly. At that moment he turned to Mullá Ḥusayn and said, ‘You are the one I have chosen. Arise and carry out this mission. With the help of God you will succeed.’
Mullá Ḥusayn was filled with joy! He had been too humble to offer himself, but when he was called upon to serve God in this way, he jumped to his feet, kissed the hem of Siyyid Káẓim’s coat, and immediately left on his journey to Iṣfahán.
In a few days’ time, Siyyid Káẓim received a letter from Mullá Ḥusayn containing the Ḥájí’s declaration of support. When the letter was handed to him, he was lecturing to his followers. However, he read the letter and the declaration to all the men present. He immediately wrote an answer to Mullá Ḥusayn, and also read that to his students. In this letter he praised Mullá Ḥusayn so highly for his service that a few of Siyyid Káẓim’s followers thought that Mullá Ḥusayn must be the Promised One. The letter was written with such love and tenderness that it was clear that Siyyid Káẓim was saying goodbye to Mullá Ḥusayn. He knew that he would never see him again on this earth. Siyyid Káẓim died on 31 December 1843.