Az-Zukhruf 43:3

Meccan · The Ornaments of Gold

إِنَّا جَعَلْنَـٰهُ قُرْءَٰنًا عَرَبِيًّا لَّعَلَّكُمْ تَعْقِلُونَ

Indeed, We have made it an Arabic Qur'an that you might understand