Hadhrat Abud darda r.a. narrated, the prophet sallallahu alaihi wa sallam said,

مَنْ حَفِظَ عَشْرَ آيَاتٍ مِنْ أَوّل سُوْرة الكَهْفِ عُصِمَ مِنَ الدَّجَّال.

Who memorizes the first ten verses of Sura al-kahf will be saved from the trial of Dajjal. Muslim, Hadith, 809

The first 10 verses from Sura al-kahf are as follows

 اَلْحَمْدُ لِلّٰهِ الَّذِیْۤ اَنْزَلَ عَلٰی عَبْدِهِ الْكِتٰبَ وَ لَمْ یَجْعَلْ لَّهٗ عِوَجًا ؕ﴿ٜ۱﴾ قَیِّمًا لِّیُنْذِرَ بَاْسًا شَدِیْدًا مِّنْ لَّدُنْهُ وَ یُبَشِّرَ الْمُؤْمِنِیْنَ الَّذِیْنَ یَعْمَلُوْنَ الصّٰلِحٰتِ اَنَّ لَهُمْ اَجْرًا حَسَنًاۙ﴿۲﴾ مَّاكِثِیْنَ فِیْهِ اَبَدًا ۙ﴿۳﴾ وَّ یُنْذِرَ الَّذِیْنَ قَالُوا اتَّخَذَ اللّٰهُ وَلَدًا ٭﴿۴﴾مَا لَهُمْ بِهٖ مِنْ عِلْمٍ وَّ لَا لِاٰبَآىِٕهِمْ كَبُرَتْ كَلِمَةً تَخْرُجُ مِنْ اَفْوَاهِهِمْ اِنْ یَّقُوْلُوْنَ اِلَّا كَذِبًا ﴿۵﴾ فَلَعَلَّكَ بَاخِعٌ نَّفْسَكَ عَلٰۤی اٰثَارِهِمْ اِنْ لَّمْ یُؤْمِنُوْا بِهٰذَا الْحَدِیْثِ اَسَفًا ﴿۶﴾ اِنَّا جَعَلْنَا مَا عَلَی الْاَرْضِ زِیْنَةً لَّهَا لِنَبْلُوَهُمْ اَیُّهُمْ اَحْسَنُ عَمَلًا ﴿۷﴾ وَ اِنَّا لَجٰعِلُوْنَ مَا عَلَیْهَا صَعِیْدًا جُرُزًا ؕ﴿۸﴾ اَمْ حَسِبْتَ اَنَّ اَصْحٰبَ الْكَهْفِ وَ الرَّقِیْمِ كَانُوْا مِنْ اٰیٰتِنَا عَجَبًا﴿۹﴾ اِذْ اَوَی الْفِتْیَةُ اِلَی الْكَهْفِ فَقَالُوْا رَبَّنَاۤ اٰتِنَا مِنْ لَّدُنْكَ رَحْمَةً وَّ هَیِّئْ لَنَا مِنْ اَمْرِنَا رَشَدًا ﴿۱۰﴾

Praise be to Allah, Who has bestowed the Book upon His servant and has not placed therein any crookedness, A straightforward Book to warn of a severe punishment from Him, and to give the good news to the believers, who do righteous deeds, that they will have an excellent reward (Paradise) In which they will dwell for ever, And to warn those who have said that Allah has had a son, While they have no knowledge about it, nor had their fathers. Grave is the word that comes out of their mouths. They say nothing but lie. So, (O Prophet) perhaps you are going to kill yourself after them, out of grief, if they do not believe in this discourse. Surely, We have made what is on earth an adornment for it, so that We test them as to who among them is better in deeds. And surely, We are going to turn whatever is thereon into a barren land Do you think that the People of Kahf (the Cave)  and Raqim (inscription) were unusual out of Our signs? When the young men took refuge in the Cave and said, “Our Lord, bless us with mercy from Your own and provide us with guidance in our matters.