ENOfficial
Abūd Dardā’ reported God’s messenger as saying, “If anyone learns by heart ten verses at the beginning of sūra al-Kahf (Qur’ān, 18) he will be protected from the dajjal.” Muslim transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَبِي الدَّرْدَاءِ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ حَفِظَ عشر آيَات من أول سُورَة الْكَهْف عصم من فتْنَة الدَّجَّال» . رَوَاهُ مُسلم
sunnah.com