Shaykh Abdul Muhsin al-Abbaad – may Allaah preserve him – mentions in his book ‘Min Kunoozil Quraanil Kareem, Tafseeru Aayaatinn Minal Kitaabil Azeez’ (From the Treasures of the Noble Quraan, Explanation of Verses From the Mighty Book) pg. 259:
His Saying – He the Most High:
قُل لَّوْ كَانَ الْبَحْرُ مِدَادًا لِّكَلِمَاتِ رَبِّي لَنَفِدَ الْبَحْرُ قَبْلَ أَن تَنفَدَ كَلِمَاتُ رَبِّي وَلَوْ جِئْنَا بِمِثْلِهِ 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.”
[Sooratul Kahf; 18:109]
In this noble verse is a clarification that the Speech of Allaah – the Most High – is never ending, and will never be exhausted, and that even if the seas were ink for writing the Speech of Allaah, the seas would be exhausted – even if they were to be multiplied.
This is because their water is limited, and the Speech of Allaah does not come to an end; because it is unlimited and never-ending, and this is because Allaah – the Most High – has no beginning, so there is no beginning to His Speech; and He has no end, so there is no end to His Speech.
And similar to this verse is His – the Most High – saying in Soorah Luqmaan:
وَلَوْ أَنَّمَا فِي الْأَرْضِ مِن شَجَرَةٍ أَقْلَامٌ وَالْبَحْرُ يَمُدُّهُ مِن بَعْدِهِ سَبْعَةُ أَبْحُرٍ مَّا نَفِدَتْ كَلِمَاتُ اللَّهِ ۗ إِنَّ اللَّهَ عَزِيزٌ حَكِيمٌ
And if whatever trees upon the earth were pens and the sea [was ink], replenished thereafter by seven [more] seas, the words of Allah would not be exhausted. Verily, Allaah is All-Mighty, All-Wise.
[Soorah Luqmaan; 31:27]