the believers are only those who when allah is mentioned feel a fear in their hearts and when his ayat are recited unto them they increase their faith and they put their trust in their lord who perform the salah and spend out of what we have provided them.
إنما المؤمنون الذين إذا ذكر الله وجلت قلوبهم وإذا تليت عليهم آياته زادتهم إيمانا وعلى ربهم يتوكلون الذين يقيمون الصلاة ومما رزقناهم ينفقون