Is it permissible to invest a sum of money deposited with you by a friend, on the condition that he returns it upon request?
It is not permissible to invest money you have saved without the owner's permission, because it is considered a betrayal of trust. If you invest the money and profit from it without the owner's permission, then scholars differ on who owns this profit.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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