One who does not Know if the Money Taken from Bank is Halaal or Haraam
Issue No. 2423- If a person knows that there is both halal and haraam money in the bank but does not know whether the money he takes from the bank is from the haraam money or the halal money, there is no harm in taking it. However, if he is sure that it is from the haraam money, it is not permissible to appropriate it and the money is treated as a property whose owner is unknown, in which case, it should, as an obligatory precaution, be given as alms (sadaqa) in the way of Allah on behalf of its owner, with the permission of the Mujtahid. And in this issue there is no difference between domestic and foreign banks, government and non-government banks.
