According to search-discovered classical Islamic scholarship, Al-Ghayb (the Unseen) refers to the totality of existence that lies beyond the limits of human sensory perception and intellectual grasp. Imam Al-Tabari's linguistic analysis traces its root (غ-ي-ب) to meanings of concealment and absence. Ibn Kathir, commenting on the Quran's 50+ verses on the topic, explains that Iman bil-Ghayb (Faith in the Unseen) is a foundational pillar of Islam, encompassing belief in Allah, angels, the afterlife, and divine decree. The Quran makes a clear distinction between the 'witnessed' world (alam ash-shahāda) and the Unseen. Al-Qurtubi emphasizes the critical theological point established in verses like 27:65: absolute knowledge of the Unseen is an exclusive attribute of Allah. While Allah may reveal portions of it to His Messengers (72:26-27), humanity's primary access to these realities is through trust in divine revelation. This concept establishes a worldview where reality is not confined to the material, fostering humility and trust in God's infinite knowledge.