إِنَّا جَعَلْنَاهُ قُرْآنًا عَرَبِيًّا لَّعَلَّكُمْ تَعْقِلُونَ
[43:3]
Surely We have made it an Arabic Quran that you may understand.
We have made it a Qur'an in Arabic, that ye may be able to understand (and learn wisdom).
Lo! We have appointed it a Lecture, in Arabic that haply ye may understand.