Is the husband's completion of company transactions with traffic departments, customs, and banks (both Islamic and commercial) for the purpose of verifying customer checks—which may be the result of usurious loans—considered a sin and does it affect the lawfulness of his money?
There is no objection to the person mentioned working, and his salary is lawful, even if his work involves verifying checks related to usurious banks, because he is fulfilling the right of his client and is not a party to the usurious loan.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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