memorizing ten verses from the beginning of Surat al-Kahf

Abu Darda reported: The Prophet, peace and blessings be upon him, said:

Whoever memorizes ten verses from the beginning of Surat al-Kahf will be immune to the False Messiah.

مَنْ حَفِظَ عَشْرَ آيَاتٍ مِنْ أَوَّلِ سُورَةِ الْكَهْف عُصِمَ مِنْ الدَّجَّالِ

In another narration, the Prophet (ṣ) said:

مِنْ آخِرِ الْكَهْفِ

From the last ten verses of Surat al-Kahf.

Source: Ṣaḥīḥ Muslim 809