وَلَوۡ جَعَلۡنَٰهُ قُرۡءَانًا أَعۡجَمِيّٗا لَّقَالُواْ لَوۡلَا فُصِّلَتۡ ءَايَٰتُهُۥٓۖ ءَا۬عۡجَمِيّٞ وَعَرَبِيّٞۗ قُلۡ هُوَ لِلَّذِينَ ءَامَنُواْ هُدٗى وَشِفَآءٞۚ وَٱلَّذِينَ لَا يُؤۡمِنُونَ فِيٓ ءَاذَانِهِمۡ وَقۡرٞ وَهُوَ عَلَيۡهِمۡ عَمًىۚ أُوْلَٰٓئِكَ يُنَادَوۡنَ مِن مَّكَانِۭ بَعِيدٖ

Wa law ja'alnaahu Qur-aanan A'jamiyyal laqaaloo law laa fussilat Aayaatuhoo 'a A'jamiyyunw wa 'Arabiyy; qul huwa lillazeena aamanoo hudanw wa shifaaa'unw wallazeena la yu'minoona feee aazaanihim waqrunw wa huwa 'alaihim 'amaa; ulaaa'ika yunaadawna mim maakaanim ba'eed

Had We sent this as a Qur'an (in the language) other than Arabic, they would have said: "Why are not its verses explained in detail? What! (a Book) not in Arabic and (a Messenger) an Arab?" Say: "It is a Guide and a Healing to those who believe; and for those who believe not, there is a deafness in their ears, and it is blindness in their (eyes): They are (as it were) being called from a place far distant!"

— Fusilat (فُصِّلَت), 41:44