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'. Al-Mu'minun (Arabic: المؤمنون, al-muʼminūn; meaning: 'The Believers') is the 23rd chapter (sūrah) of the Qur'an. In the Quran. 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". Also, it is used as a name and one of the names of God.
https://en.wikipedia.org/wiki/Mumin