Memorizing the first ten verses of al‑Kahf protects from the Dajjāl. The Prophet ﷺ said: “Whoever memorizes ten verses from the beginning of Sūrat al‑Kahf is protected from the Dajjāl.” (Muslim). In another wording: “from the end of al‑Kahf.” (Muslim).
العربية: عن أبي الدرداء رضي الله عنه أنّ النبيّ ﷺ قال: «مَن حفظ عشر آياتٍ من أوّل سورة الكهف عُصِم من الدجّال». (مسلم).
Memorize the first ten āyāt of al‑Kahf — a shield against the greatest of trials.