Mardūd (مردود) means a report that is not accepted. If a narrator lacks the qualities required for acceptance, the report is not accepted.
For example, knowing only that someone transmits reports is not enough; their reliability in doing so must also be established.
Being a narrator and being a reliable narrator are different matters.
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Acceptance and rejection: Maqbūl and Mardūd
Mardūd (مردود) means a report that is not accepted. If a narrator lacks the qualities required for acceptance, the report is not accepted.
For example, knowing only that someone transmits reports is not enough; their reliability in doing so must also be established.
Being a narrator and being a reliable narrator are different matters.