According to search-discovered classical Islamic scholarship, the concept of Al-Amīn (Trustworthy) is a cornerstone of faith and ethics, signifying perfect integrity, reliability, and honesty. This quality is so fundamental that every prophet mentioned in the Quran, from Nuh to Muhammad (peace be upon them), identified themselves as a 'trustworthy messenger' (رَسُولٌ أَمِينٌ), as highlighted in the tafsir of Ibn Kathir. This ensures the divine message was delivered without corruption. The principle extends to the celestial realm, where Angel Jibril is called the 'Trustworthy Spirit' (الرُّوحُ الْأَمِينُ), guaranteeing the Quran's pure transmission. The broader concept, Amanah (trust), as explained by Al-Qurtubi, encompasses all responsibilities a person is given, from religious duties to financial trusts and keeping secrets. Stemming from the same root as Iman (faith), trustworthiness is not merely a social virtue but a direct reflection of one's belief and accountability to Allah.