جَفَّ الْقَلَمُ بِمَا هُوَ كَائِنٌ إِلَى يَوْمِ الْقِيَامَةِ
The Pen has dried concerning all that will occur until the Day of Judgment.
Ink may be changed while being written, but once it has dried, its writing cannot be altered in the same manner. The expression emphasizes the established character of Allah’s definitive decree. A creature’s efforts do not revise what Allah has eternally known.