the faithful are only those whose hearts tremble when allah is mentioned and when his signs are recited to them they increase their faith and who put their trust in their lord maintain the prayer 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