It is narrated from Sayyiduna Mu'adh that the Prophet (peace and blessings be upon him) said: Whoever recites the beginning and the end of Surah Al-Kahf, it will become a source of light for him from his feet to his head. Whoever recites the entire Surah Al-Kahf, a circle of light will be made for him between the heavens and the earth.
Hadith Referenceمسند احمد / مسند المكيين / 15626
Hadith Gradingحکم دارالسلام:إسناده ضعيف مسلسل بالضعفاء