“This is concerning my question before abu ‘ Abd Allah (a.s.), about the case of a man who had found a certain amount of property from banu ’Umayyah. He gives charity thereof, helps his relatives, performs al-Hajj therewith, so that Allah may forgive what he has earned and says, ’Good deeds remove bad deeds.’ Abu ‘Abd Allah (a.s.), said, ’Sins do not expiate sins. Only good deeds remove sins.’ He (the Imam) then said, ’If he has mixed lawful with unlawful and is not able to distinguish, then it is not harmful.’”