Whoever memorizes ten 'Ayat (Verses) from the beginning of Surat Al-Kahf, will be protected from the False Messiah. One can also say in every prayer after the final Tashahhud before ending the prayer, seeking the protection of Allah from the trials of the False Messiah (Dajjal).
Source: Muslim: 809
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset