Al-Kahf is the 18th chapter (sūrah) of the Qur'an with 110 verses (āyāt). Regarding the timing and contextual background of the revelation (asbāb al-nuzūl), it is an earlier Meccan surah, which means it was revealed before Muhammad's hijrah to Medina, instead of after.

Summary

Exegesis

9-26 "Companions of the cave"

Verses 9–26 of the chapter retell the Christian folktale of the "companions of the cave". A few young believers lived in a time when they were tortured for their beliefs. Upon the guidance of God, they fled the city where believers were persecuted, together with their dog, and took refuge in a cave where they fell asleep. When they awoke they found that the people of the city had become believers.

27 No room for explicit textual changes of the Qur'an

"And recite (and teach) what has been revealed to thee of the Book of thy Lord: none can change His Words, and none wilt thou find as a refuge other than Him. Translation Yusuf Ali (Orig. 1938)" The commentary by Ozma Nasir Makarim Shirazi says, "There is no room for diversity to enter into His Words and Knowledge. His Speech and His Knowledge is not like the speech and knowledge of human beings which, as a result of a new invention or information, has to be changed". Ibn Kathir says this verse means of the words in the Quran, "no one can alter them, distort them or misinterpret them."

32-45 The parable of the two men

In verses 32–44, the surah discusses a parable of two men, one of whom had been given blessings from God and the other poor. The rich one wronged his soul and started showing off with his wealth and noble lineage. "And he had fruit, so he said to his companion while he was conversing with him, "I am greater than you in wealth and mightier in [numbers of] men."" Verse 36 explains that the rich man also told his companion that he doubted the existence of Judgment Day. At the end of the parable, God destroys what He had given the man. Q18:45 Imam Musa al-Kadhim narrates in Kitab al-Kafi that Ali would bequeath his companions to view this world with the vision of an ascetic because it dislodges its residents. Ali provides them with the parable of a lush, green garden with scented dew that accumulates under the blades of grass but then gets separated from it in the morning, as Allah has said,

60-82 Islamic view of Moses

The third main story within the chapter (verses 60–82 ) is that of Musa (Moses) traveling to gain knowledge from another servant of God who is never mentioned by name, in tafsir of ibn Kathir he is called Al-Khidr.

83-98 Dhul-Qarnayn

Finally, the surah mentions in verses 83–98 a man who traveled a great deal and reached the east and the west of the earth – namely, Dhul-Qarnayn. In one part of the story, Dhul-Qarnayn helps a tribe of people build a massive wall of iron between two mountains to protect them from the nations of Gog and Magog. It goes on to say that this wall will be only destroyed on Judgement Day. The wall may have reflected a distant knowledge of the Great Wall of China (the 12th-century scholar al-Idrisi drew a map for Roger II of Sicily showing the "Land of Gog and Magog" in Mongolia), or of various Sassanid Persian walls built in the Caspian area against the northern barbarians, or a conflation of the two.

Traditional revelational circumstances

Arab Muslim historian and hagiographer, Ibn Ishaq, reported in his traditional book (oral traditions) of biography of Muhammad, Sirat Rasul Allah that the 18th surah of the Qur'an (which includes the story of Dhu l-Qarnayn) was revealed to the Islamic prophet Muhammad by God on account of some questions posed by rabbis residing in the city of Medina – the verse was revealed during the Meccan period of Muhammad's life. According to Ibn Ishaq, Muhammad's tribe, the powerful Quraysh, were greatly concerned about their tribesman who had started claiming prophethood and wished to consult rabbis about the matter. The Quraysh sent two men to the rabbis of Medina, reasoning that they had superior knowledge of the scriptures and about the prophets of God. The two Quraysh men described their tribesman, Muhammad, to the rabbis. The rabbis told the men to ask Muhammad three questions:"They [the rabbis] said, "Ask him about three things which we will tell you to ask, and if he answers them then he is a Prophet who has been sent; if he does not, then he is saying things that are not true, in which case how you will deal with him will be up to you. Ask him about some young men in ancient times, what was their story for theirs is a strange and wondrous tale. Ask him about a man who traveled a great deal and reached the east and the west of the earth. What was his story and ask him about the Ruh (Holy spirit) – what is it? If he tells you about these things, then he is a Prophet, so follow him, but if he does not tell you, then he is a man who is making things up, so deal with him as you see fit."" According to Ibn Ishaq, when Muhammad was informed of the three questions from the rabbis, he said that he would have the answers in the morning but did not say "if God wills it". For fifteen days, Muhammad waited eagerly for the revelation. Muhammad did not answer the question until then. Doubt in Muhammad began to grow amongst the people of Mecca. Then, after fifteen days, Muhammad received the revelation of al-Kahf as an answer to the questions.

Virtues

There is a hadith in Sahih Muslim that states that Muhammad said (Concerning The False Messiah, Al-Masih ad-Dajjal): ""He who amongst you would survive to see him should recite over him the opening verses of Sura Kahf"" Another Hadith in Sahih Muslim states: ""If anyone learns by heart the first ten verses of Surah Al-Kahf, he will be protected from the Dajjal""

Common Muslim and Christian theme

The story of believers falling asleep in a cave for a long time is present also in the Christian tradition, see Seven Sleepers.

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