Jami` at-Tirmidhi 2885
جامع الترمذي#2885Sahihحَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ، قَالَ حَدَّثَنَا أَبُو دَاوُدَ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي إِسْحَاقَ، قَالَ سَمِعْتُ الْبَرَاءَ بْنَ عَازِبٍ يَقُولُ بَيْنَمَا رَجُلٌ يَقْرَأُ سُورَةَ الْكَهْفِ إِذْ رَأَى دَابَّتَهُ تَرْكُضُ فَنَظَرَ فَإِذَا مِثْلُ الْغَمَامَةِ أَوِ السَّحَابَةِ فَأَتَى رَسُولَ اللَّهِ صلى الله عليه وسلم فَذَكَرَ ذَلِكَ لَهُ . فَقَالَ النَّبِيُّ صلى الله عليه وسلم " تِلْكَ السَّكِينَةُ نَزَلَتْ مَعَ الْقُرْآنِ أَوْ نَزَلَتْ عَلَى الْقُرْآنِ " . وَفِي الْبَابِ عَنْ أُسَيْدِ بْنِ حُضَيْرٍ . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
Narrated Abu Ishaq:hearing Al-Bara say: "There was a man reciting [Surat] Al-Kahf when he saw his riding animal stamping his feet, so he looked and there was something like a shadow or cloud, so he went to the Messenger of Allah (ﷺ) and mentioned that to him. The Prophet (ﷺ) said: "That was the tranquility which descends with the Qur'an, or descends because of the Qur'an
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 45:11