According to search-discovered classical Islamic scholarship, Hajj (الحج) is the sacred pilgrimage to the Kaaba in Makkah and represents the fifth and culminating pillar of Islam. Ibn Kathir's tafsir on Quran 22:27 explains that Hajj was established by the proclamation of Prophet Ibrahim (Abraham), making it a journey deep-rooted in monotheistic history. It is a once-in-a-lifetime spiritual duty, obligatory upon every adult Muslim who possesses the physical and financial ability (istita'ah), as stipulated in Quran 3:97. The synthesis of Quranic verses and prophetic traditions, as analyzed by jurists like Al-Qurtubi, outlines a series of profound rites—from Ihram (consecration) and Tawaf (circumambulation) to the stand at Arafat—that symbolize submission, purification, and the equality of all believers. This journey is not merely a physical travel but a transformative experience designed to erase past sins and unify the global Muslim community (Ummah) in a singular act of devotion to Allah.