Fussilat 41:3

كِتَٰبٌۭ فُصِّلَتْ ءَايَٰتُهُۥ قُرْءَانًا عَرَبِيًّۭا لِّقَوْمٍۢ يَعْلَمُونَ ٣

A Book whose verses have been detailed, an Arabic Qur'an for a people who know,