The only way to obtain the tranquility of the heart and self-assurance lies in believing in God, in the Qur’an, and to follow the Prophet Muhammad, may God bless him and grant him peace
Allah said ( interpretation of the meaning ) : { Those who have believed and whose hearts are assured by the remembrance of Allah . Unquestionably, by the remembrance of Allah hearts are assured." } Quran ( 13 : 28 )
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https://noorinternational.net/articles/Quran-download