Quran 50:29 from Surah Qaaf on Divine Marvels.
مَا يُبَدَّلُ ٱلۡقَوۡلُ لَدَيَّ وَمَآ أَنَا۠ بِظَلَّٰمٖ لِّلۡعَبِيدِ
English translation: Not will be changed the word with Me and not I Am unjust to My slaves
Transliteration: ma yubaddalu al-qawlu ladayya wama ana bizallamin lil'abidi