Al-Kahf, "The Cave," is the 18th surah — 110 verses revealed in Mecca. It is one of the best-known surahs, widely recited on Fridays, and it is unusual in weaving four separate stories into a single sustained meditation.14
What it is about
The surah tells four stories, each a kind of trial. First, the people of the cave — young believers who flee a hostile city and are given refuge and sleep by God for many years, a test of faith against persecution. Second, the owner of two gardens, whose pride in his wealth destroys it, a test of wealth. Third, Moses and al-Khidr, where Moses learns that God's wisdom can run deeper than what a prophet is shown, a test of knowledge. Fourth, Dhul-Qarnayn, a just ruler given power across the earth who uses it to protect the weak, a test of power.
Running through all four is a warning against being deceived by the world: "wealth and children are the adornment of the worldly life, but the enduring good deeds are better with your Lord."2
Why it matters
The Prophet ﷺ said, "Whoever memorises ten verses from the beginning of Surah Al-Kahf will be protected from the Dajjal" (the great deceiver of the end times) — fitting for a surah whose theme is holding to truth under every kind of trial.3 To read Al-Kahf in Arabic with translations and recitation, open it on Quran.com.