Quran 41:45 from Surah Fussilat on Divine Marvels.
وَلَقَدۡ ءَاتَيۡنَا مُوسَى ٱلۡكِتَٰبَ فَٱخۡتُلِفَ فِيهِۚ وَلَوۡلَا كَلِمَةٞ سَبَقَتۡ مِن رَّبِّكَ لَقُضِيَ بَيۡنَهُمۡۚ وَإِنَّهُمۡ لَفِي شَكّٖ مِّنۡهُ مُرِيبٖ
English translation: And certainly We gave Musa the Book but disputes arose therein And had it not been (for) a word that preceded from your Lord surely would have been settled between them But indeed they surely (are) in doubt about it disquieting
Transliteration: walaqad atayna musa al-kitaba fa-ukh'tulifa fihi walawla kalimatun sabaqat min rabbika laqudiya baynahum wa-innahum lafi shakkin min'hu muribin