(25) باب عَلاَمَاتِ النُّبُوَّةِ فِي الإِسْلاَمِ
Narrated Al-Bara' bin `Azib:
A man recited Surat-al-Kahf (in his prayer) and in the house there was a (riding) animal which got frightened and started jumping. The man finished his prayer with Taslim, but behold! A mist or a cloud hovered over him. He informed the Prophet (ﷺ) of that and the Prophet (ﷺ) said, "O so-and-so! Recite, for this (mist or cloud) was a sign of peace descending for the recitation of Qur'an."
Reference: Sahih al-Bukhari 3614
In-book reference: Book 61, Hadith 121
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 56, Hadith 811