Debt as a price of an unlawful item

A: In this case because this debt is for something Haram (prohibited), you are not permitted to pay it (Part No. 14; Page No. 70) to whom it is due. This is because doing so is co-operation in sin and transgression and the Messenger of Allah (peace be upon him) cursed the devourer (taker) of Riba (usury/interest), its payer, its two witnesses and its scribe. The Prophet (peace be upon him) cursed ten people related to wine, among them are the one who sells it, the one who buys it, and the one who takes its price. Conversely, in case that such a debt is a price of something that is Mubah (permissible); it is obligatory on you to pay it back because it is a right of one of the slaves of Allah that you have to fulfill. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.