18. Surah Al-Kahf (The Cave) is the 18th chapter of the Quran, containing 110 verses. Highly celebrated for its spiritual virtues—including the Prophetic recommendation to recite it every Friday for protection against trials—this Surah serves as an intellectual and spiritual anchor. Structurally, it is built around four major narratives that address the primary trials (fitnah) a human being faces across time.