In Farid al-Din Attar's Mosibat Nameh, the tale of Sufyan and the captive nightingale serves as an allegory for spiritual liberation and the magnetic pull of true devotion. Sufyan buys a trapped nightingale from a child and sets it free. Although the bird initially flies to the garden, it returns to Sufyan at night, gazing in awe at his tireless, intense worship until dawn. The allegory illustrates that once a soul (represented by the bird) is liberated from the cage of worldly attachments by a spiritual master, it is naturally drawn to the divine light, piety, and sincere devotion of the enlightened ascetic.