(36) باب نُزُولِ السَّكِينَةِ لِقِرَاءَةِ الْقُرْآنِ
Ibn Ishaq reported:
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 reference: Book 6, Hadith 285
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1740