Hadith on Quran: Tranquility descends upon recitation of the Quran and Surah Al-Kahf

Al-Bara reported: A man was reciting Surah Al-Kahf and there was a horse tied with two ropes at his side, a cloud overshadowed him, and it came nearer and nearer as his horse became frightened of it. He went to the Prophet, peace be upon him, in the morning and mentioned that to him. He said, “Continue reciting so-and-so. Verily, that was tranquility which came down for the recitation of the Quran.”

[Sahih Muslim, Book 4, Number 1739]

الْبَرَاءَ يَقُولُ  قَرَأَ رَجُلٌ الْكَهْفَ وَفِي الدَّارِ دَابَّةٌ فَجَعَلَتْ تَنْفِرُ فَنَظَرَ فَإِذَا ضَبَابَةٌ أَوْ سَحَابَةٌ قَدْ غَشِيَتْهُ قَالَ فَذَكَرَ ذَلِكَ لِلنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ اقْرَأْ فُلَانُ فَإِنَّهَا السَّكِينَةُ تَنَزَّلَتْ عِنْدَ الْقُرْآنِ أَوْ تَنَزَّلَتْ لِلْقُرْآنِ

صحيح مسلم كِتَاب صَلَاةِ الْمُسَافِرِينَ وَقَصْرِهَا تلك السكينة تنزلت للقرآن