«وَلَا يُقْبَلُ حَدِيثُ الْمُبْهَمِ مَا لَمْ يُسَمَّ»
The report of an unnamed transmitter is not accepted until that person has been identified by name.
This is not proof that the unnamed person lied. It means that the basis for evaluating his integrity is missing. Without identity, statements of criticism or endorsement cannot be reliably assigned to the actual intermediary.
Further, discovering the name does not end the investigation. The person’s biographical standing and the report’s remaining conditions must still be assessed. Identifying the mubham makes proper criticism possible; it does not automatically authenticate the report.