arthra
Baha'i
"The prisoners were placed in two rows, facing each other over the stocks in which their feet were held. The air they breathed was foul; the stone floor was covered with filth and infested with vermin and no warmth relieved the dungeon's icy gloom, and these conditions were matched by the brutality of the guards and officials towards the Bábí victims who were chained together in that dismal place. Baha’u’llah’s chains were tied to His nephew, Mirza Mahmud.
"Every day one of the Babi prisoners was released from his stocks and chains and taken to the gallows. Baha'u'llah related how He taught the facing lines to sing verses in response to each other. One row would sing, 'God is sufficient unto me; He verily is the All-Sufficing!', and the other would reply, 'In Him let the trusting trust." (Nabil-i-A’zam, the Dawn-Breakers, p. 461)
from:
Baha'i Stories: Prisoner in the Siyah-Chal
"Every day one of the Babi prisoners was released from his stocks and chains and taken to the gallows. Baha'u'llah related how He taught the facing lines to sing verses in response to each other. One row would sing, 'God is sufficient unto me; He verily is the All-Sufficing!', and the other would reply, 'In Him let the trusting trust." (Nabil-i-A’zam, the Dawn-Breakers, p. 461)
from:
Baha'i Stories: Prisoner in the Siyah-Chal