Ibn Kathir writes in his commentary on Surah Al-Kahf:

Al-Bara reported: A man recited Surah al-Kahf and there was an animal in the house which began acting in a nervous manner. He looked and saw a fog or cloud overhead. He mentioned this to the Prophet, peace and blessings be upon him, and the Prophet said:

اقْرَأْ فُلَانُ فَإِنَّهَا السَّكِينَةُ تَنَزَّلَتْ عِنْدَ الْقُرْآنِ أَوْ تَنَزَّلَتْ لِلْقُرْآنِ

Continue reciting. Verily, that was tranquility which came down for the recitation of the Quran.

Source: Sahih Muslim 795, Grade: Sahih

The man who recited it was Usaid ibn Al-Hudayr.

Abu Ad-Darda reported: The Prophet, peace and blessings be upon him, said:

مَنْ حَفِظَ عَشْرَ آيَاتٍ مِنْ أَوَّلِ سُورَةِ الْكَهْف عُصِمَ مِنْ الدَّجَّالِ

Whoever memorizes ten verses from the beginning of Surat al-Kahf will be protected from the False Messiah.

Source: Sahih Muslim 809, Grade: Sahih

This was also recorded by Muslim, Abu Dawud, An-Nasa’i and At-Tirmidhi. According to the version recorded by At-Tirmidhi:

مَنْ حَفِظَ ثَلَاثَ آيَاتٍ مِنْ أَوَّلِ الْكَهْف

Whoever memorizes three verses from the beginning of Surat al-Kahf.

Source: Sunan At-Tirmidhi 2886, Grade: Sahih

At-Tirmidhi said it is “good and authentic” (hasan sahih).

In his Mustadrak, Al-Hakim recorded from Abu Sa’eed that the Prophet, peace and blessings be upon him, said:

مَنْ قَرَأَ سُورَةَ الْكَهْفِ فِي يَوْمِ الْجُمُعَةِ أَضَاءَ لَهُ مِنَ النُّورِ مَا بَيْنَ الْجُمُعَتَيْنِ

Whoever recites Surat al-Kahf on the day of Friday will have a light for him between this Friday and the next.

Source: Sunan Al-Kubra 5856, Grade: Sahih

Al-Hakim said, “This tradition has an authentic chain of narration, but Al-Bukhari and Muslim did not record it.”

Al-Hafiz Al-Bayhaqi also recorded it in his Sunan from Al-Hakim, then he narrated with his own chain that the Prophet, peace and blessings be upon him, said:

مَنْ قَرَأَ سُورَةَ الْكَهْفِ كَمَا أُنْزِلَتْ كَانَتْ لَهُ نُورًا يَوْمَ الْقِيَامَةِ

Whoever recites Surat al-Kahf as it was revealed will have light on the Day of Resurrection.

Source: Sunan Al-Kubra 5856, Grade: Sahih

Source: Tafsīr al-Qurʼān al-ʻAẓīm 18:1

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