مسائل المنتخبه (Articles Of Islamic Acts) - الخوئي، السيد أبوالقاسم - الصفحة ٣٨١ - KHUMS

IV. IF LAWFUL PROPERTY MIXES WITH UNLAWFUL PROPERTY
١٨٢٢. If lawful property gets mixed up with unlawful property in such a way that it is not possible to separate them from each other, and the owner of the unlawfulproperty and its quantity are not known, and it is also not known whether the quantity f the unlawful property is more or less than the KhumS the person concerned should payKhums on the entire property,_ d after the payment of Khums the balance property will become lawful for him.
١٨٢٣. If lawful property gets mixed up with unlawful property d the person concerned knows the quantity of unlawful property (whether it is more or less thanKhums) but does not know its owner, he should give an equivalent quantity as alms on behalf of its owner, and the obligatory precaution is that he should also obtainpermission from the Religious Head.
١٨٢٤. If lawful property gets mixed up with unlawful property and the person concerned does not know the quantity of unlawful property, but knows its owner, theyshould make a compromise with each other and if the owner of the property is not agreeable to make a compromise, the person concerned should give him the property about whichhe is sure that it belongs to him. And it is better that he should give him some thing more than that which probably belongs to him.
١٨٢٥. If a person pays Khums on lawful property mixed with unlawful property and learns later that the quantity of unlawful property was more than Khums he shouldgive as alms on behalf of the owner of unlawful property, that quantity which he knows was in excess of the Khums paid by him.
١٨٢٦. If a person pays Khums on lawful property mixed with unlawful property or gives some property as alms on behalf of person, who is not known to him, and the owner of that property is found later, it is not necessary for the person