Is it permissible to take back a loan from a man most of whose wealth is haraam?

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Taking from one who deals in haraam things
He went to pay off what he owed to the telecommunications company, and they told him “You do not owe us anything.” Is his debt waived?

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What should a person who accumulated his wealth from haraam sources do?
Taking from one who deals in haraam things
He went to pay off what he owed to the telecommunications company, and they told him “You do not owe us anything.” Is his debt waived?

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