Surah Fussilat, ayah 45

وَلَقَدۡ ءَاتَيۡنَا مُوسَى ٱلۡكِتَٰبَ فَٱخۡتُلِفَ فِيهِۚ وَلَوۡلَا كَلِمَةٞ سَبَقَتۡ مِن رَّبِّكَ لَقُضِيَ بَيۡنَهُمۡۚ وَإِنَّهُمۡ لَفِي شَكّٖ مِّنۡهُ مُرِيبٖ ٤٥

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

And We had already given Moses the Scripture, but it came under disagreement.¹³⁹⁹ And if not for a word [i.e., decree]¹⁴⁰⁰ that preceded from your Lord, it would have been concluded between them. And indeed they are, concerning it [i.e., the Qur’ān], in disquieting doubt.