Sura al-Kahf 18:17

وَتَرَى ٱلشَّمْسَ إِذَا طَلَعَت تَّزَٰوَرُ عَن كَهْفِهِمْ ذَاتَ ٱلْيَمِينِ وَإِذَا غَرَبَت تَّقْرِضُهُمْ ذَاتَ ٱلشِّمَالِ وَهُمْ فِى فَجْوَةٍ مِّنْهُ ذَٰلِكَ مِنْ ءَايَٰتِ ٱللَّـهِ مَن يَهْدِ ٱللَّـهُ فَهُوَ ٱلْمُهْتَدِ وَمَن يُضْلِلْ فَلَن تَجِدَ لَهُۥ وَلِيًّا مُّرْشِدًا

wa-tara l-shamsa idhā ṭalaʿat ttazāwaru ʿan kahfihim dhāta l-yamīni wa-idhā gharabat ttaqriḍuhum dhāta l-shimāli wa-hum fī fajwatin minhu dhālika min āyāti allāhi man yahdi allāhu fa-huwa l-muhtadi wa-man yuḍlil fa-lan tajida lahu waliyyan murshidan

Thou wouldst have seen the sun, when it rose, declining to the right from their Cave, and when it set, turning away from them to the left, while they lay in the open space in the midst of the Cave. Such are among the Signs of Allah: He whom Allah, guides is rightly guided; but he whom Allah leaves to stray,- for him wilt thou find no protector to lead him to the Right Way.

Sura al-Kahf 18:24

إِلَّآ أَن يَشَآءَ ٱللَّـهُ وَٱذْكُر رَّبَّكَ إِذَا نَسِيتَ وَقُلْ عَسَىٰٓ أَن يَهْدِيَنِ رَبِّى لِأَقْرَبَ مِنْ هَٰذَا رَشَدًا

illā an yashāʾa allāhu wa-idhkur rabbaka idhā nasīta wa-qul ʿasā an yahdiyani rabbī li-aqraba min hādhā rashadan

Without adding, "So please Allah!" and call thy Lord to mind when thou forgettest, and say, "I hope that my Lord will guide me ever closer (even) than this to the right road."

Sura al-Kahf 18:57

وَمَنْ أَظْلَمُ مِمَّن ذُكِّرَ بِـَٔايَٰتِ رَبِّهِۦ فَأَعْرَضَ عَنْهَا وَنَسِىَ مَا قَدَّمَتْ يَدَاهُ إِنَّا جَعَلْنَا عَلَىٰ قُلُوبِهِمْ أَكِنَّةً أَن يَفْقَهُوهُ وَفِىٓ ءَاذَانِهِمْ وَقْرًا وَإِن تَدْعُهُمْ إِلَى ٱلْهُدَىٰ فَلَن يَهْتَدُوٓا۟ إِذًا أَبَدًا

wa-man aẓlamu mimman dhukkira bi-āyāti rabbihi fa-aʿraḍa ʿanhā wa-nasiya mā qaddamat yadāhu innā jaʿalnā ʿalā qulūbihim akinnatan an yafqahūhu wa-fī ādhānihim waqran wa-in tadʿuhum ilā l-hudā fa-lan yahtadū idhan abadan

And who doth more wrong than one who is reminded of the Signs of his Lord, but turns away from them, forgetting the (deeds) which his hands have sent forth? Verily We have set veils over their hearts lest they should understand this, and over their ears, deafness, if thou callest them to guidance, even then will they never accept guidance.