Benefit of reading Surah Kahf on Friday
Abu Sa'eed al-Khudri narrated,
The Prophet {Peace be upon him}said,
Who ever reads Surat 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]
The Prophet {Peace be upon him}said:
Who ever 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
[Narrated by al-Haakim, 2/399; al-Bayhaqi, 3/249. Ibn Hajar said in Takhreej al-Adhkaar that this is a hasan hadeeth, and he said, this is the strongest report that has been narrated concerning reading Soorat al-Kahf. See: Fayd al-Qadeer, 6/198. It was classed as saheeh by Shaykh al-Albaani in Saheeh al-Jaami 6470]
Ibn Umar (may Allaah be pleased with him) narrated:
The Messenger of Allaah {Peace be upon him} said:
Who ever reads Surat al-Kahf on the day of Jumu'ah, a light will shine for him from beneath his feet to the clouds of the sky, which will shine for him on the Day of Resurrection, and he will be forgiven (his sins) between the two Fridays.
[Al-Mundhiri said, this was narrated by Abu Bakr ibn Mardawayh in his Tafseer, with an isnaad with which there was nothing wrong. See al-Targheeb wa l-Tarheeb, 1/298]
Al-Mannaawi said:
Al-Haafiz ibn Hajar said in his Amaali: In some reports it says the day of Jumu'ah and in some reports it says the night of Jumu'ah They may be reconciled by saying that what is meant is the day which includes the night and vice versa.
[Fayd al-Qadeer, 6/199] .
Al-Mannaawi also said:
It is recommended to read it during the day or night of Jumu'ah, as al-Shaafa'i (may Allaah have mercy on him) stated._
[Fayd al-Qadeer, 6/198]
And Allaah knows best.