The authority of a solitary report varies with the legal setting. The fact that “one person reported it” does not mean that witness number, personal integrity and effects on others are governed by an identical rule in every context.
Issues concerning a divine right without punishment are treated differently from private claims that impose liability. Some statements merely convey information; others seek to establish a new obligation against another person.
For example, reporting a status relevant to permissibility and testifying that a person owes a debt serve different legal functions.
One must first define the character of the report or testimony, whether it imposes an obligation, and the legal result requested; only then can the appropriate conditions be applied.