Surah Fussilat, verse 44

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

41:44 If We had made it a non-Arabic Qur’an, they would have said, “If only its verses were made clear? What! A non-Arabic [book] and an Arab [messenger]?” Say, “It is a guidance and healing for those who believe. As for those who do not believe, there is deafness in their ears and they are blind to [understand] it – it is as if they are being called from a far off place.”