In Section 7 of Farid al-Din Attar's Asrar Nameh, the tale of the scavenger (kannas) who faints in a perfumer's shop serves as an allegory for spiritual habituation and blindness. The scavenger, whose senses are accustomed to foul odors from his trade, collapses upon smelling sweet musk and rosewater. He is only revived when another scavenger holds dung to his nose. Attar explicitly compares this to an individual who is habituated to the 'stench of heresy' (گند بدعت) and has never experienced the 'musk of the Sunnah' (مشگ سنت). For such a spiritually corrupted person, exposure to the pure fragrance of divine truth is intolerable, illustrating how worldly ignorance repels the soul from spiritual enlightenment.