Abu Sa’eed al-Khudri (Radiallahu Anhu) has narrated: “Whoever reads Surah al-Kahf on the night of Jumu’ah, will have a light that will stretch between him and the Ancient House (the Ka’bah).”...
[Narrated by al-Daarimi, 3407. This hadeeth was classed as saheeh by Shaykh al-Albaani in Saheeh al-Jaami, 6471]