فلنقطع بأن من أظهر الله تعالى المعجزة على يده، تصديقا له في دعوى الرسالة، كان صادقا فيما أتى به من الأحكام
One whom God confirms through a miracle in his claim to messengership is truthful in the rulings he conveys.
The inference is not drawn from an astonishing occurrence alone. It depends on establishing that the sign confirms the particular divine commission. A religious report genuinely transmitted from such a messenger then possesses a distinct authority.
Two evidential tasks remain: establishing the commission and establishing that the given statement was in fact conveyed by the messenger.