According to search-discovered classical Islamic scholarship, As-Sa'ah (The Hour) is the Quranic term for the inevitable, cataclysmic end of the temporal world and the commencement of the Day of Judgment. Across more than 40 verses, the Quran establishes its absolute certainty, its sudden and unexpected arrival, and the profound principle that its knowledge rests exclusively with Allah. Classical commentators like Ibn Kathir, drawing on verses such as 7:187 and 31:34, explain that this divine concealment is a test of faith and a means to ensure humanity's constant vigilance. Al-Qurtubi emphasizes that the Hour's imminence, highlighted in verses like 54:1 ('The Hour has drawn near'), serves as a powerful moral and spiritual impetus for repentance and righteous deeds. The linguistic analysis by Al-Tabari of the word 'Sa'ah' points to a specific, decisive moment, reinforcing the theme of a sudden, all-encompassing event that will inaugurate the final accountability. This synthesis of scholarly views presents The Hour not as a mere chronological point, but as a foundational pillar of Aqeedah (creed) that shapes the entire worldview and spiritual orientation of a Muslim.