Abud-Darda' (May Allah be pleased with him) reported:
The Messenger of Allah ﷺ said: "Whoever commits to memory the first ten Ayat of the Surat Al-Kahf, will be protected from (the trial of) Ad-Dajjal (Antichrist)."

[Muslim].

In another narration, the Messenger of Allah ﷺ said: "(Whoever commits to memory) the last ten Ayat of Surat Al-Kahf, he will be protected from (the trial of) Ad-Dajjal (Antichrist)."

وعن أبي الدرداء رضي الله عنه أن رسول الله ﷺ قال: "من حفظ عشر آيات من أول سورة الكهف، عصم من الدجال" وفي رواية: "من آخر سورة الكهف" ((رواهما مسلم)).