According to search-discovered classical Islamic scholarship, Ghusl (غسل) is the full-body ritual purification, or full ablution, mandated by the Quran and Sunnah to remove a state of major ritual impurity (janābah). Classical jurists across the four major schools of thought (Hanafi, Maliki, Shafi'i, Hanbali) are in consensus that Ghusl is a required act of worship involving the intention to purify oneself and ensuring water washes the entire body. Ibn Kathir's tafsir on verses like 4:43 and 5:6 emphasizes that this purification is a prerequisite for acts like prayer (Salah). The obligatory acts include washing the entire body, with the Hanafi school specifically adding the rinsing of the mouth and nose as essentials. The Sunnah of the Prophet Muhammad (ﷺ) provides a more detailed, complete method, which includes performing wudu before washing the body. This synthesis of Quranic command and Prophetic practice establishes Ghusl as a foundational element of Taharah (ritual purity) in Islam.