The Prophet (salAllahu alayhi wasalam) said, ‘Whoever recited Surah al Kahf in the same manner in which it was revealed, it will serve for him as a light on the Day of Judgement, from his domicile to Makkah. And whoever recited the last ten verses, and it happens that the Dajjal should appear after that, Dajjal will not be empowered over him’. [Hakim 1/564 & Dhahabi]

Abu’d-Darda’ reported that the Messenger of Allah (salAllahu alayhi wasalam) said, “Anyone who memorises ten ayats from the beginning of Surat al-Kahf (18) will be protected from the Dajjal.” [Muslim, Riyad as-Salihin by Imam an-Nawawi 183 #1012] One variant has, “from the end of Surat al-Kahf.”

The Prophet (salAllahu alayhi wasalam) said, ‘Whoever recited Surah al Kahf on a Friday, Allah will kindle for him abundant light to brightly illuminate the period between the two Fridays (the Friday on which the recitation was made and the next Friday)’ [Hakim 2/367, Mishkat al-Masabih #2175, however Baihaqi disagreed with it’s authenticity in Sahih Al Jami 2/1104]

Narrated Al-Bara’bin Azib: A man was reciting Surah 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, and told him of that experience. The Prophet said, “That was As-Sakina (tranquility) which descended because of (the recitation of) the Qur’an.”
[Sahih al-Bukhari 6:61 #531, at-Tirmidhi 2810/A]

– See more at: http://1000gooddeeds.com/2009/10/23/good-deed-56-read-surah-kahf-on-jumah/#sthash.XDiMdNfu.dpuf