Ar-Ra‘d 13:28
الَّذِينَ آمَنُوا وَتَطْمَئِنُّ قُلُوبُهُم بِذِكْرِ اللَّهِ ۗ أَلَا بِذِكْرِ اللَّهِ تَطْمَئِنُّ الْقُلُوبُ ٢٨
Allatheena amanoo watatmainnu quloobuhum bithikri Allahi ala bithikri Allahi tatmainnu alquloobu
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Those who believe, their hearts being at rest in God’s remembrance -- in God’s remembrance are at rest the hearts (13:28)