What is the ruling on someone who died two years ago, having acquired money that was later discovered to be unlawful, while he was unaware of its unlawfulness at the time? And are the heirs liable for anything after their recent knowledge of the money's unlawfulness, given that the money was fully spent during the deceased's lifetime, and the inheritance does not include anything similar to it? And are the heirs required to repay the debt incurred by this money? And is it permissible to donate this money to the poor and needy due to the difficulty of returning it to the original source and to avoid harm?

Unlawfully acquired wealth is forbidden (haram) and must be returned to its owner. If the person who took it dies, the heirs are obligated to return an equivalent amount from his estate, if found, even if it depleates the entire inheritance. However, if the deceased did not leave any wealth, the heirs are not required to repay those funds from their own private money, and there is no sin upon them, as the Prophet (peace be upon him) said: "Indeed, this son of yours neither commits a sin against you, nor do you commit a sin against him," and his recitation of: "And no bearer of burdens will bear the burden of another." So, if the deceased had a debt, it is to be paid from his estate. If there is no estate, the heirs are not obligated to pay it from their own private funds, unless they volunteer to do so.