This ayah refutes the deviant sect Ahl usunna wal jama and their evil scholars who make differing permissible.
وَلَوْ شَاءَ رَبُّكَ لَجَعَلَ النَّاسَ أُمَّةً وَاحِدَةً ۖ وَلَا يَزَالُونَ مُخْتَلِفِينَ
إِلَّا مَن رَّحِمَ رَبُّكَ ۚ وَلِذَٰلِكَ خَلَقَهُمْ ۗ وَتَمَّتْ كَلِمَةُ رَبِّكَ لَأَمْلَأَنَّ جَهَنَّمَ مِنَ الْجِنَّةِ وَالنَّاسِ أَجْمَعِي
And if your Lord had willed, He could have made mankind one community, but they will not cease to differ. Except whom your Lord has given mercy, and for that He created them. But the word of your Lord is to be fulfilled that, "I will surely fill Hell with jinn and men all together."