Muhammad, from Muhammad bin Ya'qub, from Ali bin Ibrahim, from his father, from Ibn Al-Mughirah, from Abu Al-Hasan عليه السلام, who said: I asked: 'Is there a limit for istinja (cleansing)?' Imam عليه السلام said: 'No, it is until the area is clean.' I asked: 'What if the area is clean but the odor remains?' Imam عليه السلام said: 'The odor is not considered (to be criteria for needing cleansing).'