A man recited Sûrat 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 Taslîm, 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 As-Sakîna (tranquillity a sign of peace and-reassurance alongwith angels) descending for the recitation of the Qur'ân." [4:811-O.B]