Surah al Kahf is the 18th Surah of Quran and it tells the story of the believers in ancient time who when received the message of Truth accepted it. However, they were to face retaliation from the society they lived in and hence the flee from the city and found protection in a cave where Allah Almighty gave them sleep that lasted for centuries and till then their whole city had converted into believers. This Surah gives the message that those who believe in Allah and ask for protection from Him, He gives them the best protection the likes of which the world has never seen.