Surah Al-Kahf on Fridays: Why It's Read and What It Teaches

Every Friday, Muslims around the world open their mushafs to Surah Al-Kahf, the 18th surah of the Quran. Many read it each week for years without ever being told why, or what holds its 110 verses together.

This article looks at the reports behind the Friday reading, how the surah came to be revealed, and the four stories at its heart, with links to read each passage for yourself.

About the surah

Al-Kahf means "the cave", named after the young believers who took refuge in one. It is a Meccan surah, revealed before the Prophet ﷺ migrated to Medina, at a time when the Muslims of Mecca were a small, pressured community. It sits in the 15th and 16th juz and has 110 verses.

It opens with praise of Allah "who has sent down upon His Servant the Book and has not made therein any deviance" (18:1) and closes with a verse that sums up its message (18:110), discussed at the end of this article.

Why it is read on Fridays

The practice rests on a report from the Companion Abū Saʿīd al-Khudrī: whoever reads Surah Al-Kahf on Friday, a light will shine for them between the two Fridays. It is reported by al-Ḥākim and al-Bayhaqī, among others, with different wordings.

Scholars have discussed its grading. Some narrations attribute the words to the Prophet ﷺ, and others to Abū Saʿīd himself. Many scholars, including al-Albānī, accepted it as authentic; others noted that even the version stopping at Abū Saʿīd describes a reward that a Companion would not say from his own opinion. Reading Al-Kahf on Friday has been the practice of Muslims across schools of thought for centuries.

Since the Islamic day begins at sunset, scholars have said the time for it runs from sunset on Thursday until sunset on Friday. It can be read in one sitting or spread across the day.

Protection from the Dajjal

Separate from the Friday reports, there is a firmly authentic hadith about the surah's opening. Abū al-Dardāʾ reported that the Prophet ﷺ said whoever memorises ten verses from the beginning of Surah Al-Kahf will be protected from the Dajjal, the great deceiver who will appear before the end of time (Sahih Muslim 809). In the long hadith of al-Nawwās ibn Samʿān describing the Dajjal, the Prophet ﷺ told anyone who meets him to recite the opening verses of Al-Kahf over him (Sahih Muslim 2937).

Memorising verses 1 to 10 is a manageable goal, and a good one to set alongside the weekly reading.

Tranquility descending

Al-Barāʾ ibn ʿĀzib reported that a man was reciting Surah Al-Kahf with his horse tied beside him, when a cloud came down and began to cover him, drawing closer and closer, and the horse started to shy away. In the morning he told the Prophet ﷺ, who said: "That was the tranquility (sakīnah), which descended because of the Quran." (Sahih al-Bukhari 5011)

How it was revealed

The best-known account comes from Ibn Isḥāq's biography of the Prophet ﷺ. The Quraysh, wanting to test his claim to prophethood, sent two men to the Jewish scholars of Medina for advice. The scholars suggested three questions: about young men who disappeared in ancient times, about a man who travelled to the east and the west of the earth, and about the soul.

The Prophet ﷺ said he would answer the next day, but did not add "if Allah wills". Revelation then paused for some days, and the Quraysh began to mock him. When it came, Al-Kahf answered the first two questions with the stories of the youths of the cave and of Dhul-Qarnayn. The question about the soul is answered in Surah Al-Isrāʾ (17:85). And in the middle of the story of the cave, Al-Kahf carries a lesson for the Prophet ﷺ and for every believer:

And never say of anything, "Indeed, I will do that tomorrow," Except [when adding], "If Allāh wills." (18:23-24)

Scholars have noted weakness in the chain of this account, so it is best treated as background rather than certain history. The two verses themselves are the reason so many Muslims say in shāʾ Allāh when speaking of the future.

The four stories

Al-Kahf is built around four stories. Many teachers describe them as four trials that every person meets in some form: a trial of faith, of wealth, of knowledge and of power. That framing is a way of reflecting on the surah rather than something the surah states, but it helps to read the stories side by side.

The youths of the cave (verses 9-26)

A group of young men lived among a people who worshipped others besides Allah. Refusing to give up their faith, they left everything and took refuge in a cave, with a prayer that many Muslims still memorise:

إِذۡ أَوَى ٱلۡفِتۡيَةُ إِلَى ٱلۡكَهۡفِ فَقَالُواْ رَبَّنَآ ءَاتِنَا مِن لَّدُنكَ رَحۡمَةٗ وَهَيِّئۡ لَنَا مِنۡ أَمۡرِنَا رَشَدٗا

Our Lord, grant us from Yourself mercy and prepare for us from our affair right guidance. (18:10)

Allah caused them to sleep, and they "remained in their cave for three hundred years and exceeded by nine" (18:25). When they woke, the world had changed and they became a sign for the people of their time. People argued about how many they were; the Quran tells us that "None knows them except a few" and not to dispute over it (18:22).

The story is about holding on to faith when everything around you pulls the other way, and trusting Allah when you have nothing else.

The owner of the two gardens (verses 32-44)

Allah gave one man two gardens of grapevines and date palms, with a river running between them. Proud of his wealth, he told his poorer companion that he had more money and more people behind him, entered his garden and said he did not think it would ever perish, or that the Hour would ever come. His companion reminded him of the One who created him from dust. The garden was destroyed, and the man was left wringing his hands over what he had spent on it, wishing he had not associated anyone with his Lord.

The surah follows the story with a parable of this world's life: like rain that brings plants to life before they dry up and are scattered by the wind (18:45). Then comes one of its best-known verses:

Wealth and children are [but] adornment of the worldly life. But the enduring good deeds are better to your Lord for reward and better for [one's] hope. (18:46)

Musa and al-Khidr (verses 60-82)

The Prophet Musa (Moses) set out to meet a man the Quran describes as "a servant from among Our servants to whom We had given mercy from Us and had taught him from Us a [certain] knowledge" (18:65). The hadith name him as al-Khiḍr. Musa asked to follow him and learn, and al-Khidr warned that he would not be able to bear it patiently.

Three times al-Khidr did something that seemed wrong: he damaged a boat belonging to poor people, he killed a boy, and he rebuilt a falling wall for a town that had refused them food. Each time Musa objected. At their parting, al-Khidr explained: the boat was spared from a king who seized every sound ship, the boy would have led his believing parents into rebellion and disbelief, and the wall hid a treasure belonging to two orphans whose father had been righteous. "And I did it not of my own accord" (18:82).

The story is a lesson in humility about knowledge: even a great prophet sees only part of what Allah is doing, and things that look like loss can hold mercy.

Dhul-Qarnayn (verses 83-98)

Dhul-Qarnayn, "the one of the two horns", was a ruler whom Allah gave power and the means to reach his goals. He travelled to the west and to the east, ruling justly among the peoples he found. Then he reached a people who complained of Gog and Magog (Yaʾjūj and Maʾjūj) spreading corruption in the land and offered to pay him to build a barrier (18:94). He refused payment, asked only for their labour, and built a wall of iron and molten copper.

Having finished it, he gave the credit away: "This is a mercy from my Lord" (18:98). Who exactly Dhul-Qarnayn was is not stated in the Quran, and scholars have long differed over it. The lesson does not depend on it: power is a trust, to be used for justice and attributed to Allah.

How the surah ends

After the four stories, the surah warns of "the greatest losers as to [their] deeds... those whose effort is lost in worldly life, while they think that they are doing well" (18:103-104). It reminds us that if the sea were ink for the words of Allah, it would run dry first (18:109). And it closes with a verse that gathers everything together:

قُلۡ إِنَّمَآ أَنَا۠ بَشَرٞ مِّثۡلُكُمۡ يُوحَىٰٓ إِلَيَّ أَنَّمَآ إِلَٰهُكُمۡ إِلَٰهٞ وَٰحِدٞۖ فَمَن كَانَ يَرۡجُواْ لِقَآءَ رَبِّهِۦ فَلۡيَعۡمَلۡ عَمَلٗا صَٰلِحٗا وَلَا يُشۡرِكۡ بِعِبَادَةِ رَبِّهِۦٓ أَحَدَۢا

Say, "I am only a man like you, to whom has been revealed that your god is one God. So whoever would hope for the meeting with his Lord - let him do righteous work and not associate in the worship of his Lord anyone." (18:110)

The youths, the gardener, Musa and Dhul-Qarnayn each met a different test. The answer the surah gives to all of them is the same: sincere faith in one God, and good deeds done for Him alone.

Read it this Friday

Read Surah Al-Kahf in the Uthmani or IndoPak script, with English or Urdu translation, or play Mishary Alafasy's recitation and follow along. Each verse has its own page, so you can bookmark where you stop and pick up from there.

Sources

• The Quran, Surah Al-Kahf (18) and Al-Isrāʾ 17:85, in the Saheeh International translation
• Sahih Muslim 809 and 2937, and Sahih al-Bukhari 5011
• al-Ḥākim, al-Mustadrak, and al-Bayhaqī, on reading Al-Kahf on Friday
• Ibn Isḥāq, al-Sīrah al-Nabawiyyah, on the occasion of revelation
• The commentaries (tafsīr) of al-Ṭabarī and Ibn Kathīr on Surah Al-Kahf

The wording of the hadith above is summarised rather than translated word for word; follow the links to read the full narrations. For questions of religious practice, please ask a qualified scholar.