Sahih Muslim, 1856

Al-Bara' reported that a person was reciting Surat al-Kahf and there was a horse tied with two ropes at his side, a cloud overshadowed him, and as it began to come nearer and nearer his horse began to take fright from it. He went and mentioned that to the Prophet (ﷺ) in the morning, and he (the Holy Prophet) said:That was tranquillity which came down at the recitation of the Qur'an

Rapporté par al-Bara’ : Al-Bara’ a rapporté qu’une personne récitait la sourate al-Kahf alors qu’un cheval, attaché à côté de lui avec deux cordes, se trouvait là. Un nuage l’a alors recouvert, et à mesure qu’il s’approchait, le cheval s’est mis à prendre peur. Il en parla au Prophète ﷺ le matin, et celui-ci lui dit : « C’était la tranquillité qui est descendue lors de la récitation du Coran. »