A few months later, when precisely the events foretold in the tablets occurred, Mírzá Abu'l-Faḍl accepted the Baháʼí Faith and became a Baháʼí on 20 September 1876. As soon as he became a Baháʼí, Abu'l-Faḍl began to teach the new religion to others, and when news spread of his conversion away from Islam, he was removed from the religious college. He found a new position as a teacher at a school for Zoroastrian children that was established by Mánikc͟hi Sáhib, an Indian Parsi. During his time at the school, a number of Zoroastrians converted to the Baháʼí Faith including Ustad Javanmard and Mulla Bahram Akhtar-Khavari. He continued to teach the Baháʼí Faith during the next ten years that he spent in Tehran, and helped Mírzá Husayn Hamadani produce an account of the history of the Bábí and Baháʼí religions, the "Tarikh-i-Jadid" ("The New History"), which was commissioned by Mánikc͟hi Sáhib. In Tehran, he was also imprisoned on three occasions. He was first imprisoned in December 1876 when it was found that he had converted to the Baháʼí Faith; he was released after five months. He was next imprisoned in 1882-83 for nineteen months, with fifty or so other Baháʼís in Tehran, when the governor of the city, Kamran Mirza, ordered their arrests at the instigation of Sayyid Sadiq Sanglaji, a religious leader in the city. Then, in October 1885 he was imprisoned for another six months, once again, due to orders from Kamran Mirza.