(Al-Kahf) 18 : 13
نَحْنُ نَقُصُّ عَلَيْكَ نَبَأَهُمْ بِالْحَقِّ ۚ إِنَّهُمْ فِتْيَةٌ آمَنُوا بِرَبِّهِمْ وَزِدْنَاهُمْ هُدًى
It is We who explain to you their story in Truth; indeed they were a few youths who believed with their Lord, and We increased them in Guidance.
When the youths individually prayed with soul to their Lord as told in verse 18: 10, the Merciful Lord Who is the Knower of the status of the chests increased them their Guidance and saved them by separating them into a cave from the disbelieving community. Today, the Safeguard Adhikr is formed as Book. So whoever holdfasts It, he did holdfast Lord and is guided into the Straightpath as explained in verses 3: 101-102 and 5: 48. See explanation 8: 2-4.