" مَنْ حَفِظَ عَشْرَ آيَاتٍ مِنْ أَوَّلِ سُورَةِ الْكَهْفِ عُصِمَ مِنَ الدَّجَّالِ "
Abu al-Dardā’ reported that the Messenger of Allah ﷺ said: “Whoever memorizes the first ten verses from Sūrat al-Kahf (The Cave) will be protected from the Dajjāl.” Reference: Sahih Muslim 809