Surah Hud, ayah 110

وَلَقَدۡ ءَاتَيۡنَا مُوسَى ٱلۡكِتَٰبَ فَٱخۡتُلِفَ فِيهِۚ وَلَوۡلَا كَلِمَةٞ سَبَقَتۡ مِن رَّبِّكَ لَقُضِيَ بَيۡنَهُمۡۚ وَإِنَّهُمۡ لَفِي شَكّٖ مِّنۡهُ مُرِيبٖ ١١٠

Walaqad ātaynā mūsal-kitāba fakhtulifa fīhi walawlā kalimatun sabaqat mir rabbika laqudiya baynahum wa innahum lafī shakkim minhu murīb

And We had certainly given Moses the Scripture, but it came under disagreement. And if not for a word⁵⁷⁹ that preceded from your Lord, it would have been judged between them. And indeed they are, concerning it [i.e., the Qur’ān], in disquieting doubt.