The Qur'an revealed in Arabic language

وَكَذَٰلِكَ أَنزَلْنَـٰهُ قُرْءَانًا عَرَبِيًّا وَصَرَّفْنَا فِيهِ مِنَ ٱلْوَعِيدِ لَعَلَّهُمْ يَتَّقُونَ أَوْ يُحْدِثُ لَهُمْ ذِكْرًا

And thus We have sent it down as an Arabic Qur’ān and have diversified therein the warnings that perhaps they will avoid [sin] or it would cause them remembrance.