A Mūʾmin (m.pl. Mūʾminūn مؤمنون, f.pl. ) is a Muslim who has secured Īmān in their heart. Only Allāh can know if somebody is a Mūʾmin. It is the interior dimension of a Muslim. A Muʾmin is confident and secure.
- The believers are only those who, when Allah is mentioned, their hearts become fearful, and when Allah’s verses are recited to them, it increases them in faith; and upon their Master they rely — The ones who establish prayer, and from what We have provided them, they spend. Those are the believers, truly. For them are degrees [of high position] with their Lord and forgiveness and noble provision. 8:3-5