Ar Ra’d Ayah 28

ٱلَّذِينَ ءَامَنُواْ وَتَطْمَئِنُّ قُلُوبُهُم بِذِكْرِ ٱللَّهِ‌ۗ أَلَا بِذِكْرِ ٱللَّهِ تَطْمَئِنُّ ٱلْقُلُوبُ ٢٨ those who believe and whose hearts find comfort in the remembrance of Allah. Surely in the remembrance of Allah do hearts find comfort.