Mirza Abu'l-Fadl states in his writings that he himself, while in Tihran, met the son of Muhammad Big, and heard him recount the remarkable experiences his father had had in the course of his journey to Tabriz in the company of the Bab. Ali-Akbar Big was a fervent believer in the Cause of Baha'u'llah and was known as such by the Baha'is of Persia.