I heard al-Bara' as saying that a man recited al-Kahf when an animal was there in the house and it began to take fright. And as he looked around, he found a cloud overshadowing it. He mentioned that to the Messenger of Allah (ﷺ). Upon this he said: O so and so, recite on (the surah) as- Sakina descends at the (recitation of the Qur'an) or on account (of the recitation) of the Qur'an.
Reference: Sahih Muslim 795 b In-book : Book 6, Hadith 285 USC-MSA web (English) : Book 4, Hadith 1740 (deprecated)
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