The Cave
أَفَحَسِبَ ٱلَّذِينَ كَفَرُوٓا۟ أَن يَتَّخِذُوا۟ عِبَادِى مِن دُونِىٓ أَوْلِيَآءَ ۚ إِنَّآ أَعْتَدْنَا جَهَنَّمَ لِلْكَـٰفِرِينَ نُزُلًا
Then do those who disbelieve think that they can take My servants instead of Me as allies? Indeed, We have prepared Hell for the disbelievers as a lodging.
Nearby ayahs help place verse 18:102 in sequence and meaning.
وَعَرَضْنَا جَهَنَّمَ يَوْمَئِذٍ لِّلْكَـٰفِرِينَ عَرْضًا
And We will present Hell that Day to the Disbelievers, on display -
ٱلَّذِينَ كَانَتْ أَعْيُنُهُمْ فِى غِطَآءٍ عَن ذِكْرِى وَكَانُوا۟ لَا يَسْتَطِيعُونَ سَمْعًا
Those whose eyes had been within a cover [removed] from My remembrance, and they were not able to hear.
قُلْ هَلْ نُنَبِّئُكُم بِٱلْأَخْسَرِينَ أَعْمَـٰلًا
Say, [O Muhammad], "Shall we [believers] inform you of the greatest losers as to [their] deeds?
ٱلَّذِينَ ضَلَّ سَعْيُهُمْ فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا وَهُمْ يَحْسَبُونَ أَنَّهُمْ يُحْسِنُونَ صُنْعًا
[They are] those whose effort is lost in worldly life, while they think that they are doing well in work."