Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
quran:13:28

Those who have believed and whose hearts are assured by the remembrance of Allah. Unquestionably, by the remembrance of Allah hearts are assured."  

those who believe and whose hearts are reassured, find rest, by God’s remembrance, that is, by His promise ˹of reward˺. Verily by God’s remembrance are hearts reassured, that is, the hearts of the believers;
القرآن:١٣:٢٨

الَّذِينَ آمَنُوا وَتَطْمَئِنُّ قُلُوبُهُمْ بِذِكْرِ اللَّهِ ۗ أَلَا بِذِكْرِ اللَّهِ تَطْمَئِنُّ الْقُلُوبُ  

{الذين آمنوا وتطمئن} تسكن {قلوبهم بذكر الله} أي وعده {ألا بذكر الله تطمئن القلوب} أي قلوب المؤمنين.