مَا يُبَدَّلُ الْقَوْلُ لَدَيَّ وَمَا أَنَا بِظَلَّامٍ لِّلْعَبِيدِ (The Word is not changed with Me, and I Am not a wrongdoer to My slaves." [ 50:29]
That is, 'I have made my decision which will certainly be implemented: it will never be changed. I will not punish anyone, except on account of their sins after the proof has been established against them. This is an absolutely fair and just decision.'