(V.2:248) Narrated Al-Barâ’: A man was reciting Sûrah Al-Kahf and his horse was tied with two ropes beside him. A cloud came down and spread over that man, and it kept on coming closer and closer to him till his horse started jumping (as if afraid of something). When it was morning, the man came to the Prophet صلى الله عليه وسلم and told him of that experience. The Prophet صلى الله عليه وسلم said, "That was As-Sakînah (tranquillity or peace and reassurance along with angels), which descended because of (the recitation of) the Qur’ân." (Sahih Al-Bukhâri, Vol. 6, Hadîth No.531).