What is the শরعي (Shari'i) ruling concerning wealth acquired through zina (fornication/adultery), which includes huge sums in European banks, a rented building, and a laundry business, especially after its owner repents and refrains from disposing of it? Is it permissible for him to invest part of the wealth and then donate the principal later as charity?

If someone acquired unlawful wealth and repented, then if the money has been spent, there is nothing due from him. However, if the money is still in his possession, he must dispose of it by spending it on charitable causes and giving it to the poor and needy. This is unless he is in need himself, in which case he may take from it what suffices his need and donate the remainder. It is permissible for a needy person to take from unlawful money what suffices his need for treatment or sustenance, or to use it as capital for a trade from which he can earn a living, provided that he donates the borrowed capital once he becomes self-sufficient, or borrows from it with the intention of repaying it when he is able. It is not permissible to deposit money in interest-based banks except with the intention of safekeeping, and it must be disposed of quickly through charity or charitable projects.