Is there any authentic hadith about reading Surah Kahf on Friday?
Bismillahi Ta’ala
Walaikum Assalam Warahmatullah
Imam Hakim rh. has mention a narration in his Mustadrak:
عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ رَضِيَ اللَّهُ عَنْهُ، أَنَّ النَّبِيَّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِنَّ مَنْ قَرَأَ سُورَةَ الْكَهْفِ يَوْمَ الْجُمُعَةِ أَضَاءَ لَهُ مِنَ النُّورِ مَا بَيْنَ الْجُمُعَتَيْنِ»
المستدرك على الصحيحين للحاكم (2/ 399)
Translation: Sayiduna Abu Saeed al Khudri rd. reports that Nabi ﷺ said, Whosever recites Surah al-Kahf on the day of Friday, shall have light shine for him between the two Fridays. The sanad of this narration is Saheeh according to Imam Hakim rh.
Other similar narrations have been mentioned in Shu’b of Imam Bayhaqi rh. as well as Sunan Darimi; Jami’ Sagheer etc.
Wallahu A’lam
And Allah Ta’āla Knows Best
Mufti Faisal al-Mahmudi