According to search-discovered classical Islamic scholarship, the term 'Yawm' (Day) in the Quran holds a profound dual significance. Linguistically analyzed by authorities like Al-Tabari, it can refer to a temporal 24-hour period, often used to illustrate Allah's creative power and mercy, such as the alternation of night and day. However, its most dominant and theologically crucial meaning, discussed extensively across hundreds of verses, is 'The Day' (al-Yawm)—the ultimate Day of Judgment and Resurrection (Yawm al-Qiyamah). Tafsir expert Ibn Kathir explains that this singular Day encompasses the resurrection of all souls, a meticulous divine reckoning of deeds, and the final assignment to an eternal abode in Paradise or Hellfire. This belief in the Last Day (al-Yawm al-Akhir) is not merely a future event but a foundational pillar of Islamic faith (Iman), which, as noted by Al-Qurtubi, instills the ultimate sense of accountability and shapes the entire moral and ethical framework of a Muslim's life. This synthesis across numerous Quranic contexts establishes 'The Day' as the culmination of divine justice and the ultimate purpose of worldly existence.