We were all huddled together in one cell, our feet in stocks, and around our necks fastened the most galling of chains. The air we breathed was laden with the foulest impurities, while the floor on which we sat was covered with filth and infested with vermin. No ray of light was allowed to penetrate that pestilential dungeon or to warm its icy-coldness. We were placed in two rows, each facing the other. We had taught them to repeat certain verses which, every night, they chanted with extreme fervour. ‘God is sufficient unto me; He verily is the All-sufficing!’ one row would intone, while the other would reply: ‘In Him let the trusting trust.’ The chorus of these gladsome voices would continue to peal out until the early hours of the morning. Their reverberation would fill the dungeon, and, piercing its massive walls, would reach the ears of Násiri‘d-Dín Sháh, whose palace was not far distant from the place where we were imprisoned. ‘What means this sound?’ he was reported to have exclaimed. ‘It is the anthem the Bábís are intoning in their prison,’ they replied. The Shah made no further remarks, nor did he attempt to restrain the enthusiasm his prisoners, despite the horrors of their confinement, continued to display.
(Shoghi Effendi, The Dawn-Breakers, p. 631-632)