We have revealed it an Arabic Quran, that you may understand.*
إِنّا أَنزَلنٰهُ قُرءٰنًا عَرَبِيًّا لَعَلَّكُم تَعقِلونَ
innaaa anzalnaahu quraanan ‘Arabiyyal la ‘allakum ta’qiloon
*12:2 Why was the Quran revealed in Arabic? See 41:44 and Appendix 4.