The chest signifies religious law, religion, piety, knowledge, and wisdom. A broad and beautiful chest signifies guidance, repentance, ease in difficult matters, completeness in religion and piety, good character, relief, wealth, expanded provision, and safety; a narrow chest signifies deficiency, bad character, grief, and distress.
Ja'far al-Sadiq interprets the chest through knowledge, wisdom, generosity, miserliness, unbelief, faith, life, and death. Hair on the chest is linked with generosity, courage, and strength. For a non-Muslim, an expanded chest signifies guidance and Islam.