Mu'min or mumin (Arabic: مُؤْمِن, romanized: muʾmin; feminine: مُؤْمِنَة muʾmina) is an Arabic name and Islamic term frequently referenced in the Quran, meaning 'believer'.
[1] Al-Mu'minun (Arabic: المؤمنون, al-muʼminūn; meaning: 'The Believers') is the 23rd chapter (sūrah) of the Qur'an.
Mumin denotes a person who has complete submission to the will of God and has faith firmly established in his heart, i.e. a "faithful Muslim".
[1] The opposite term of iman (faith) is kufr (disbelief), and the opposite of mumin is kafir (disbeliever).
Indeed, whoever denies Allah, His angels, His Books, His messengers, and the Last Day has clearly gone far astray.This verse addresses the believers, exhorting them to believe, implying multiple stages of belief.