Al-Bara reported that a person was reciting Surat al-Kahf and there was a horse tied with two ropes at his side, a cloud overshadowed him, and as it began to come nearer and nearer his horse began to take fright from it. He went and mentioned that to the Prophet ﷺ in the morning, and he (the Holy Prophet) said: That was tranquility which came down at the recitation of the Quran.