18:90
حَتَّىٰٓ إِذَا بَلَغَ مَطْلِعَ ٱلشَّمْسِ وَجَدَهَا تَطْلُعُ عَلَىٰ قَوْمٍ لَّمْ نَجْعَل لَّهُم مِّن دُونِهَا سِتْرًا
Until, when he came to the rising of the sun, he found it rising on a people for whom We had not made against it any shield.
The Cave
حَتَّىٰٓ إِذَا بَلَغَ مَطْلِعَ ٱلشَّمْسِ وَجَدَهَا تَطْلُعُ عَلَىٰ قَوْمٍ لَّمْ نَجْعَل لَّهُم مِّن دُونِهَا سِتْرًا
Until, when he came to the rising of the sun, he found it rising on a people for whom We had not made against it any shield.
Nearby ayahs help place verse 18:90 in sequence and meaning.
وَأَمَّا مَنْ ءَامَنَ وَعَمِلَ صَـٰلِحًا فَلَهُۥ جَزَآءً ٱلْحُسْنَىٰ ۖ وَسَنَقُولُ لَهُۥ مِنْ أَمْرِنَا يُسْرًا
But as for one who believes and does righteousness, he will have a reward of Paradise, and we will speak to him from our command with ease."
ثُمَّ أَتْبَعَ سَبَبًا
Then he followed a way
كَذَٰلِكَ وَقَدْ أَحَطْنَا بِمَا لَدَيْهِ خُبْرًا
Thus. And We had encompassed [all] that he had in knowledge.
ثُمَّ أَتْبَعَ سَبَبًا
Then he followed a way