Is the increase in the value of investment certificates on the stock exchange, which were sold for less than their original purchase price after a fatwa prohibiting dealing with them, considered unlawfully gained wealth (mal haram) to benefit from, or is it a recovery of part of the original capital? And can the loss incurred in these certificates be considered a purifier for usurious money (mal ribawi) mixed with it, or must the usurious money be removed separately?

If the questioner believes that dealing in the Egyptian stock exchange is impermissible, she must withdraw her money. If the selling price of the documents is equal to or less than the original capital, then there is no objection to benefiting from the entire amount.

As for inherited money, if there is doubt about its impermissibility, then the default is its permissibility. However, if it is certain that the entire money is impermissible, the heir is not permitted to benefit from it and must spend it on charitable causes. If the impermissibility is confined to a specific percentage, then only that percentage must be disbursed.

If there is knowledge of an impermissible percentage of unknown quantity, the heir should strive to estimate it. If the matter is entirely unclear, the money can be divided into two halves: one half is inherited, and the other half is given out. The loss incurred from selling cannot be set against the portion that must be disbursed to purify the money; rather, it must be disbursed from the total money according to its proportion.