الَّذِينَ امَنُواْ وَتَطْمَيِنُّ قُلُوبُهُم بِذِكْرِ اللّهِThose who believed, and whose hearts find rest in the remembrance of Allah.for their hearts find comfort on the side of Allah, become tranquil when He is remembered and pleased to have Him as their Protector and Supporter.So Allah said,أَلَا بِذِكْرِ اللّهِ تَطْمَيِنُّ الْقُلُوبُVerily, in the remembrance of Allah do hearts find rest.and surely, He is worthy of it.The Meaning of Tuba Allah said,الَّذِينَ امَنُواْ وَعَمِلُواْ الصَّالِحَاتِ طُوبَى لَهُمْ وَحُسْنُ مَأبٍ