Surat al-Kahf "The Cave" is the 18th surah of the Qur'an with 110 ayat. It is a Meccan sura.
People of the Cave
Verses 9 - 26 of the chapter tell the story of the People of the cave (Ashabu Al-Kahf). Some number of young monotheistic men lived in a time where they were persecuted. They fled the city together, and took refuge in a cave where they fell asleep. God caused them to remain sleeping for 300 solar years, or 309 lunar years, and when they woke the surrounding area had become monotheistic as well.
The story of the rich and the poor
In verses 32 - 44 the surah discusses a Parable of two men, who one of them had been given blessings from God and the other was 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."At the end of the parable God destroys what he had given the man.Moses and Al-KhidrThe third main story within the chapter (verses 60 - 82) is that of Moses traveling to gainknowledge from another servant of God who is never mentioned by name, but according to the tafsir of ibn Kathir is called Al Khidr.Dhul-QarnaynFinally, the surah mentions in verses 83 - 98 a man who traveled a great deal and reached theeast and the west of the earth - namely, Dhul Qarnayn.Virtues of reciting Surat Al Kahf on Friday1.The Prophet (salAllahu alayhi wasalam) said, ‘Whoever recited Surah al Kahf in the same manner in which it was revealed, it will serve for him as a light on the Day of Judgement, from his domicile to Makkah. And whoever recited the last ten verses, and it happens that the Dajjal should appear after that, Dajjal will not be empowered over him’. [Mustadrak al-Hakim]2.Abu’d-Darda’ reported that the Messenger of Allah (salAllahu alayhi wasalam) said, “Anyone who memorises ten ayats from the beginning of Surat al-Kahf (Ch.18) will be protected from the Dajjal."3.The Prophet (salAllahu alayhi wasalam) said, ‘Whoever recited Surah al Kahf on a Friday, Allah will kindle for him abundant light to brightly illuminate the period between the two Fridays (the Friday on which the recitation was made and the next Friday)’