Imam Ahmad recorded that Al-Bara' said: "A man recited Al-Kahf and there was an animal in the house which began acting in a nervous manner. He looked, and saw a fog or cloud overhead. He mentioned this to the Prophet , who said:
(Keep on reciting so and so, for this is the tranquillity which descends when one reads Qur'an or because of reading Qur'an;) This was also recorded in the Two Sahihs. This man who recited it was Usayd bin Al-Hudayr, as we have previously mentioned in our Tafsir of Surat Al-Baqarah. Imam Ahmad recorded from Abu Ad-Darda' that the Prophet said:
(Whoever memorizes ten Ayat from the beginning of Surat Al-Kahf will be protected from the Dajjal.) This was also recorded by Muslim, Abu Dawud, An-Nasa'i and At-Tirmidhi. According to the version recorded by At-Tirmidhi,
(Whoever memorizes three Ayat from the beginning of Al-Kahf.) He said, it is "Hasan Sahih. '' In his Mustadrak, Al-Hakim recorded from Abu Sa`id that the Prophet said:
(Whoever recites Surat Al-Kahf on Friday, it will illuminate him with light from one Friday to the next.) Then he said: "This Hadith has a Sahih chain, but they (Al-Bukhari and Muslim) did not record it.'' Al-Hafiz Abu Bakr Al-Bayhaqi also recorded it in his Sunan from Al-Hakim, then he narrated with his own chain that the Prophet said:
(Whoever recites Surat Al-Kahf as it was revealed, it will be a light for him on the Day of Resurrection.)
In the Name of Allah, the Most Gracious, the Most Merciful.