According to search-discovered classical Islamic scholarship, Iman (إِيمَان), or Belief, is the foundational principle of Islam, representing a comprehensive conviction that is firmly rooted in the heart, verbally affirmed by the tongue, and actualized through righteous deeds. This definition, established by the consensus of early scholars like Imam al-Shafi'i, emphasizes that Iman is not a static belief but a dynamic state that increases with obedience to Allah and decreases with sin. Its core components are outlined in the celebrated Hadith of Jibril, where the Prophet Muhammad ﷺ defined the six pillars of Iman: belief in Allah, His Angels, His Books, His Messengers, the Last Day, and the Divine Decree (Qadar). The linguistic root of Iman, 'a-m-n', signifies security and trust, highlighting that true belief brings tranquility to the heart. The Quran mentions Iman and its derivatives over 800 times, consistently pairing belief with righteous action ('amal salih') as the inseparable twin conditions for attaining Allah's pleasure and entering Paradise. This holistic framework establishes Iman not as a mere intellectual assent, but as the very core of a Muslim's identity, worldview, and spiritual journey.