The Cave
قُل لَّوْ كَانَ ٱلْبَحْرُ مِدَادًا لِّكَلِمَـٰتِ رَبِّى لَنَفِدَ ٱلْبَحْرُ قَبْلَ أَن تَنفَدَ كَلِمَـٰتُ رَبِّى وَلَوْ جِئْنَا بِمِثْلِهِۦ مَدَدًا
Say, "If the sea were ink for [writing] the words of my Lord, the sea would be exhausted before the words of my Lord were exhausted, even if We brought the like of it as a supplement."
Nearby ayahs help place verse 18:109 in sequence and meaning.
إِنَّ ٱلَّذِينَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّـٰلِحَـٰتِ كَانَتْ لَهُمْ جَنَّـٰتُ ٱلْفِرْدَوْسِ نُزُلًا
Indeed, those who have believed and done righteous deeds - they will have the Gardens of Paradise as a lodging,
خَـٰلِدِينَ فِيهَا لَا يَبْغُونَ عَنْهَا حِوَلًا
Wherein they abide eternally. They will not desire from it any transfer.
قُلْ إِنَّمَآ أَنَا۠ بَشَرٌ مِّثْلُكُمْ يُوحَىٰٓ إِلَىَّ أَنَّمَآ إِلَـٰهُكُمْ إِلَـٰهٌ وَٰحِدٌ ۖ فَمَن كَانَ يَرْجُوا۟ لِقَآءَ رَبِّهِۦ فَلْيَعْمَلْ عَمَلًا صَـٰلِحًا وَلَا يُشْرِكْ بِعِبَادَةِ رَبِّهِۦٓ أَحَدًۢا
Say, "I am only a man like you, to whom has been revealed that your god is one God. So whoever would hope for the meeting with his Lord - let him do righteous work and not associate in the worship of his Lord anyone."