After usury was forbidden, why was the one who was subjected to usury not given a right over the one who practiced usury, even though Allah said: "You do not wrong others, and you yourselves will not be wronged"? And does this mean that the one who practiced usury and the one who was subjected to usury are equal, even though the one who practiced usury took more than his due?

Usury (Riba) is one of the gravest prohibitions and sins, and it invites the war of Allah. So, whoever among those involved in usury repents and has not yet collected his usurious debt, he is only entitled to his principal, and it is not permissible for him to take any increase. As for what the usurer took in interest before the prohibition, he is not accountable for it, as indicated by the verse: "So whoever receives an admonition from his Lord and desists, he may have what has already passed, and his affair is with Allah." Thus, he is not held accountable for what has passed, because his taking of it was before the revelation of the prohibition. Furthermore, transactions and contracts that existed before the revelation of the prohibition are not invalidated after embracing Islam. Some scholars are of the view that the verse applies to a Muslim who was ignorant of the prohibition.