وَلَوْ جَعَلْنَاهُ قُرْآنًا أَعْجَمِيًّا لَّقَالُوا لَوْلَا فُصِّلَتْ آيَاتُهُ أَأَعْجَمِيٌّ وَعَرَبِيٌّ قُلْ هُوَ لِلَّذِينَ آمَنُوا هُدًى وَشِفَاءٌ وَالَّذِينَ لَا يُؤْمِنُونَ فِي آذَانِهِمْ وَقْرٌ وَهُوَ عَلَيْهِمْ عَمًى أُولَئِكَ يُنَادَوْنَ مِن مَّكَانٍ بَعِيدٍ

Had We made it a non-Arabic Quran, they would have said, ‘Why have not its signs been articulated?’ ‘What! A non-Arabian [scripture] and an Arabian [prophet]!?’ Say, ‘It is guidance and healing for those who have faith. As for those who are faithless, there is a deafness in their ears and it is lost to their sight: [to them it is as if] they were called from a distant place.’