One person’s statement is not assessed by a single rule in every legal context. Questions concerning khabar al-wāḥid and testimony (shahādah) depend on the type of right, the burden being imposed, and the legal function of the statement.
Acceptance of a person’s report on a matter of worship does not automatically mean the same person can, alone, impose every monetary liability or personal accusation. Distinctions between rights of God and rights of persons, as well as the nature of the allegation, affect the conditions of acceptance.
Core caution: Do not apply a blanket numerical or reliability requirement before identifying the evidentiary category and the consequence sought.