Yusuf 12:2

إِنَّآ أَنزَلْنَـٰهُ قُرْءَٰنًا عَرَبِيًّا لَّعَلَّكُمْ تَعْقِلُونَ

Innā anzalnāhu qur'ānan ʿarabiyyan laʿallakum taʿqilūna

Indeed, We have sent it down as an Arabic Qur’ān¹ that you might understand.