Surah 18:109
"Say: ‘If the sea were ink for the words of my Lord, the sea would indeed give out before the words of my Lord would give out, even if We brought (another sea) like it as an extension.’"
The sūra ends with a beautiful expression of the vastness of the words of the Lord, and a modest self-estimate from the messenger.
- from The Quran with Christian Commentary: A Guide to Understanding the Scripture of Islam