Narrated Abu Ad-Darda:
that the Prophet (ﷺ) said: "Whoever recites three Ayat from the beginning of Al-Kahf he is protected from the turmoil of the Dajjal." (FR)
English reference (FR): Vol. 5, Book 42, Hadith 2886 (FR)
Arabic reference (FR): Book 45, Hadith 3127 (FR)