النحل — An-Nahl Ayat 93
وَلَوْ شَاۤءَ اللّٰهُ لَجَعَلَكُمْ اُمَّةً وَّاحِدَةً وَّلٰكِنْ يُّضِلُّ مَنْ يَّشَاۤءُ وَيَهْدِيْ مَنْ يَّشَاۤءُۗ وَلَتُسْـَٔلُنَّ عَمَّا كُنْتُمْ تَعْمَلُوْنَ
Wa lau syā'allāhu laja‘alakum ummataw wāḥidataw wa lākiy yuḍillu may yasyā'u wa yahdī may yasyā'(u), wa latus'alunna ‘ammā kuntum ta‘malūn(a).
"And if Allah had willed, He could have made you [of] one religion, but He causes to stray whom He wills and guides whom He wills. And you will surely be questioned about what you used to do."