إِنَّا أَنزَلْنَاهُ قُرْآنًا عَرَبِيًّا لَّعَلَّكُمْ تَعْقِلُونَ
Indeed We have sent it down as an Arabic Quran so that you may exercise your reason.
Agha Ali Puya Commentary
Commentary on Quran 12:2
[Pooya/Ali Commentary 12:2] No people in the world, perhaps, manifest such enthusiastic admiration for literary expression and are so moved by the word, spoken or written, as the Arabs. Hardly any language seems capable of exercising over the minds of its users such irresistible influence as Arabic. So the Quran was revealed in the Arabic language but it contains the law Allah has made for the whole mankind in all ages. Imam Jafar bin Muhammad as Sadiq said: "Learn the Arabic, the language of the final word of Allah."