Surah 27. An-Naml, Ayah 78

Decree: hukm: the disputes between rival sects can only be settled by the Decree of Allah,-(1) in the form of a Revelation, as was done by the Qur-an, or (2) by the logic of events, for hundreds of sects have been extinguished and forgotten in the course of time, and (3) in the Decree of Judgment in the Hereafter, when all jarring sects will at length see their errors.