Surat Fussilat (Explained in detail) - فصلت

وَلَوْ جَعَلْنَٰهُ قُرْءَانًا أَعْجَمِيًّا لَّقَالُوا۟ لَوْلَا فُصِّلَتْ ءَايَٰتُهُۥٓ ءَا۬عْجَمِىٌّ وَعَرَبِىٌّ قُلْ هُوَ لِلَّذِينَ ءَامَنُوا۟ هُدًى وَشِفَآءٌ وَٱلَّذِينَ لَا يُؤْمِنُونَ فِىٓ ءَاذَانِهِمْ وَقْرٌ وَهُوَ عَلَيْهِمْ عَمًى أُو۟لَٰٓئِكَ يُنَادَوْنَ مِن مَّكَانٍۭ بَعِيدٍ ﴿٤٤﴾

And if We had made it a Quran in a foreign tongue, they would certainly have said: Why have not its communications been made clear? What! a foreign (tongue) and an Arabian! Say: It is to those who believe a guidance and a healing; and (as for) those who do not believe, there is a heaviness in their ears and it is obscure to them; these shall be called to from a far-off place.