The believers are those who...

The believers are only those who, when Allah is mentioned, feel a fear in their hearts and when His Verses (this Qur'an) are recited unto them, they (i.e. the Verses) increase their Faith; and they put their trust in their Lord (Alone);

Who perform As-Salat (Iqamat-as-Salat) and spend out of that We have provided them.

It is they who are the believers in truth. For them are grades of dignity with their Lord, and Forgiveness and a generous provision (Paradise).

Surah al-Anfal [8:2-4]