There are sound hadiths from the Prophet (peace and blessings be upon him) concerning the virtues of reciting Surat Al-Kahf during the day or night of Jumu`ah ( Friday ). These include:
“Whoever reads Surat Al-Kahf on the night of Jumu`ah, will have a light that will stretch between him and the Ancient House (the Kabah).” (Ad-Darimi)
“Whoever reads Surat Al-Kahf on the day of Jumu`ah, will have a light that will shine from him from one Friday to the next.” (Al-Haakim and Al-Bayhaqi)