Sūrat al-Kahf (Arabic: سورة الكهف‎‎, "The Cave") is the 18th surah of the Qur'an with 110 ayat. It is a Meccan sura.

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"
— Sahih Muslim, Book 41, Number 7015

"Whoever reads Sura Kahf on Friday, light shall shine forth for him between the two Fridays."