then that is merely dirhams exchanged for dirhams.” This seller valued the goods at their cash price and sold them on credit. If the buyer rescinded the sale because the goods did not meet the stated description, and could neither return the goods themselves to the seller nor leave them in anyone’s safekeeping, so he sold them and kept the proceeds for the seller, he owes nothing beyond those proceeds, provided he sold them at their fair market value. And Allah knows best.

He was asked:

A man who engaged in usury died leaving wealth and a son who knew of his dealings. Does inheriting this wealth make it lawful for the son, or not?

He replied:

Whatever portion the son knows to be usurious gain, he must relinquish, returning it to its rightful owners if possible; otherwise, he must give it in charity. The remainder is not unlawful for him. However, it is recommended that he forgo the doubtful portion, provided he is not obliged to use it to repay a debt or support his dependants. If the father acquired it through usurious transactions that some jurists permit, the heir may benefit from it. If lawful and unlawful wealth are mixed together and he does not know the amount of either, he should divide it into two equal shares.