Is it true that earning money from working in usurious banks makes one's food and clothing unlawful (haram), and leads to the non-acceptance of prayers (Salat), supplications (Du'a), Hajj, and 'Umrah? And does it reduce the sin to use the usurious salary only to pay off debts, with the husband spending on food and clothing from his own private salary?

Working in a usurious bank is absolutely forbidden, as it is one of the major sins and is considered aiding in sin. One must repent and leave the job immediately, except in cases of extreme necessity that threaten life and where no lawful alternative exists, while continuously searching for an alternative. Paying off debts is not considered a necessity that permits forbidden work. The salary earned from this work is forbidden in terms of undertaking the work, but it is lawful in terms of ownership, and there is no obligation to donate it, according to the majority of jurists. As for acts of worship such as prayer, Hajj, and supplication, they are accepted by Allah's permission, knowing that there is no reward for Hajj performed with unlawful money, and that sins may prevent the acceptance of supplication.