Surah Al-Kahf, the eighteenth surah of the Quran, is 110 ayat long and takes about 23 minutes to listen to in full. It is the surah people specifically search for on Fridays, because of a hadith that recommends reading it on that day, and its first ten ayat carry a second, separate hadith of their own. Below are both hadith with their grading, the first ten ayat quoted in full in Arabic and English, and a link to listen to the whole surah.
Why Surah Al-Kahf is read on Fridays
The hadith behind the habit is recorded in Mishkat al-Masabih 2175, graded hasan by al-Albani: "If anyone recites sūra al-Kahf on Friday, light will shine brightly for him till the next Friday." That single line is the entire basis for the Friday habit: no fiqh ruling attaches to it beyond what the hadith itself says, and it does not specify a particular hour of the day.
In practice, many listeners fit the full 23 minutes in wherever it works: after Fajr, on the commute, or in the time before Jumuah prayer. Others split it into a few shorter sessions across the day. Either way covers what the hadith describes: reading, or listening to, Surah Al-Kahf on Friday.
The first ten ayat and the Dajjal
A second, separate hadith concerns only the opening of the surah. In Sahih Muslim 809a, the Prophet ﷺ said: "If anyone learns by heart the first ten verses of the Surah al-Kahf, he will be protected from the Dajjal." Ibn Kathir's tafsir records this hadith directly under his commentary on the surah's first ayah.
Those ten ayat, quoted below, are also where the surah sets out its purpose: praise for the revelation, a warning to anyone who claims Allah has a son, a note that this present life is a test rather than a destination, and the opening line of the story that gives the surah its name, the young men who took refuge in a cave.
Surah Al-Kahf 18:1-10 in Arabic and English
الْحَمْدُ لِلَّهِ الَّذِي أَنزَلَ عَلَىٰ عَبْدِهِ الْكِتَابَ وَلَمْ يَجْعَل لَّهُ عِوَجًا ۜ ﴿١﴾ قَيِّمًا لِّيُنذِرَ بَأْسًا شَدِيدًا مِّن لَّدُنْهُ وَيُبَشِّرَ الْمُؤْمِنِينَ الَّذِينَ يَعْمَلُونَ الصَّالِحَاتِ أَنَّ لَهُمْ أَجْرًا حَسَنًا ﴿٢﴾ مَّاكِثِينَ فِيهِ أَبَدًا ﴿٣﴾ وَيُنذِرَ الَّذِينَ قَالُوا اتَّخَذَ اللَّهُ وَلَدًا ﴿٤﴾
الكهف: 1-4"[All] praise is [due] to Allāh, who has sent down upon His Servant [Muḥammad (ﷺ)] the Book and has not made therein any deviance. [He has made it] straight, to warn of severe punishment from Him and to give good tidings to the believers who do righteous deeds that they will have a good reward [i.e., Paradise]. In which they will remain forever And to warn those who say, "Allāh has taken a son"."
Al-Kahf 18:1-4, Saheeh International
Ibn Kathir explains that Allah opens the surah praising Himself for revealing a Book with nothing twisted or confusing in it, a plain warning to those who reject it and good news to those who believe and act on it. The warning named specifically here, he notes, is against those who said Allah has taken a son.
مَّا لَهُم بِهِ مِنْ عِلْمٍ وَلَا لِآبَائِهِمْ ۚ كَبُرَتْ كَلِمَةً تَخْرُجُ مِنْ أَفْوَاهِهِمْ ۚ إِن يَقُولُونَ إِلَّا كَذِبًا ﴿٥﴾ فَلَعَلَّكَ بَاخِعٌ نَّفْسَكَ عَلَىٰ آثَارِهِمْ إِن لَّمْ يُؤْمِنُوا بِهَٰذَا الْحَدِيثِ أَسَفًا ﴿٦﴾
الكهف: 5-6"They have no knowledge of it, nor had their fathers. Grave is the word that comes out of their mouths; they speak not except a lie. Then perhaps you would kill yourself through grief over them, [O Muḥammad], if they do not believe in this message, [and] out of sorrow."
Al-Kahf 18:5-6, Saheeh International
This is comfort as much as description. Ibn Kathir links it to similar lines elsewhere in the Quran telling the Prophet ﷺ not to destroy himself in grief over people who refuse to believe: his responsibility was to deliver the message, not to carry the outcome.
إِنَّا جَعَلْنَا مَا عَلَى الْأَرْضِ زِينَةً لَّهَا لِنَبْلُوَهُمْ أَيُّهُمْ أَحْسَنُ عَمَلًا ﴿٧﴾ وَإِنَّا لَجَاعِلُونَ مَا عَلَيْهَا صَعِيدًا جُرُزًا ﴿٨﴾
الكهف: 7-8"Indeed, We have made that which is on the earth adornment for it that We may test them [as to] which of them is best in deed. And indeed, We will make that which is upon it [into] a barren ground."
Al-Kahf 18:7-8, Saheeh International
Ibn Kathir reads these two ayat together as the surah's frame for everything that follows: the world is made attractive on purpose, as a test of who acts best, not as a place to settle into permanently, since it is also described as headed for barren ground.
أَمْ حَسِبْتَ أَنَّ أَصْحَابَ الْكَهْفِ وَالرَّقِيمِ كَانُوا مِنْ آيَاتِنَا عَجَبًا ﴿٩﴾ إِذْ أَوَى الْفِتْيَةُ إِلَى الْكَهْفِ فَقَالُوا رَبَّنَا آتِنَا مِن لَّدُنكَ رَحْمَةً وَهَيِّئْ لَنَا مِنْ أَمْرِنَا رَشَدًا ﴿١٠﴾
الكهف: 9-10"Or have you thought that the companions of the cave and the inscription were, among Our signs, a wonder? [Mention] when the youths retreated to the cave and said, "Our Lord, grant us from Yourself mercy and prepare for us from our affair right guidance.""
Al-Kahf 18:9-10, Saheeh International
Ibn Kathir notes that this opening line of the story plays the case down rather than up: their story is presented briefly here before it is told in detail, and Allah says it is not, in fact, more wondrous than the sun, the moon or the sky, only one sign among many.
How long Surah Al-Kahf takes to listen to
Quran Orb's recording of the full surah, recited by Maher Al-Muaiqly in Hafs an Asim, runs 1,393 seconds: 23 minutes and 13 seconds. Maher Al-Muaiqly's Hafs recording is murattal, the steady, unhurried delivery used for most complete-surah recordings, so it holds a fairly even pace across all 110 ayat rather than slowing down or speeding up for effect.
A simple Friday listening routine
A workable pattern for a busy Friday: play the full 23 minutes once, at whatever point in the day actually happens, rather than waiting for an ideal quiet moment that may not arrive. If ten minutes is genuinely all there is, the first ten ayat quoted above make a complete unit on their own, short enough to repeat until they are memorized, which is what the second hadith above is actually about. The same principle used for building a daily listening habit, attaching it to something already happening every week, works just as well for a single weekly surah: Friday morning coffee, the walk to Jumuah, or right after it.
Frequently asked questions
Is the Friday virtue of Surah Al-Kahf an authentic hadith?
Yes. It is recorded in Mishkat al-Masabih, hadith 2175, and graded hasan (a sound, acceptable grade one level below sahih) by the hadith scholar al-Albani.
Do the first ten ayat have to be recited from memory to count for the Dajjal hadith?
The hadith in Sahih Muslim 809a specifies memorizing, learning by heart, the first ten ayat, not simply reading or listening to them. Listening repeatedly, as described above, is a normal way to work toward memorizing them.
How many ayat does Surah Al-Kahf have in total?
110, revealed in Makkah. The first ten are quoted above; the surah as a whole covers several long stories, including the people of the cave, a man with two gardens, Musa and al-Khidr, and Dhul-Qarnayn.
Does it matter which reciter I listen to?
Not for the hadith, which names no reciter. Quran Orb's recording uses Maher Al-Muaiqly's Hafs an Asim murattal recitation, a steady pace that works well for a first full listen or for repeating the opening ayat while memorizing them.
Sources
- Saheeh International, English translation of the Quran
- Tafsir Ibn Kathir
- Mishkat al-Masabih 2175, graded hasan
- Sahih Muslim 809a