Read and reflect on verse 4263 from Surah Fussilat: Thus, too, have We vouchsafed revelation unto Moses aforetime, and thereupon disputes arose about it. And [then, as now,] had it not been for a decree...
وَلَقَدْ آتَيْنَا مُوسَى الْكِتَابَ فَاخْتُلِفَ فِيهِ ۗ وَلَوْلَا كَلِمَةٌ سَبَقَتْ مِنْ رَبِّكَ لَقُضِيَ بَيْنَهُمْ ۚ وَإِنَّهُمْ لَفِي شَكٍّ مِنْهُ مُرِيبٍ
Thus, too, have We vouchsafed revelation unto Moses aforetime, and thereupon disputes arose about it. And [then, as now,] had it not been for a decree that had already gone forth from thy Sustainer, all would indeed have been decided between them [from the outset]. As it is, behold, they [who will not believe in this divine writ] are in grave doubt, amounting to suspicion, about what it portends.