Bara bin Azib reported,

A man was reciting Surah al-Kahf while his riding animal was tied up beside him. The animal began to start and shy, so the man looked up and saw a cloud, or a mist, that had enveloped him. He became frightened and went to the Prophet ﷺ and mentioned this.I asked, "Did the Prophet ﷺ name that man?"He replied, "Yes."The Prophet ﷺ said, "Recite, so-and-so, for that was tranquility descending for the Quran," or "with the Quran."

Ahmad 18509

Sahih

حدثنا عفان حدثنا شعبة عن أبي إسحاق قال سمعت

البراء قال

قرأ رجل سورة الكهف وله دابة مربوطة فجعلت الدابة تنفر فنظر الرجل إلى سحابة قد غشيته أو ضبابة ففزع فذهب إلى النبي ﷺ قلت سمى النبي ﷺ ذاك الرجل قال نعم فقال اقرأ فلان فإن السكينة نزلت للقرآن أو عند القرآن

أحمد 18509صحيح
Contents
Reference
Commentary
Ayat
Collection
Musnad Ahmad
Book
Bara bin Azib
Numbering
Darussalam 18509
Ahmad 18509