Surah Ar-Ra'd 13:37

وَكَذَٰلِكَ أَنزَلْنَـٰهُ حُكْمًا عَرَبِيًّا ۚ وَلَئِنِ ٱتَّبَعْتَ أَهْوَآءَهُم بَعْدَ مَا جَآءَكَ مِنَ ٱلْعِلْمِ مَا لَكَ مِنَ ٱللَّهِ مِن وَلِىٍّ وَلَا وَاقٍ

And thus We have revealed it as an Arabic legislation. And if you should follow their inclinations after what has come to you of knowledge, you would not have against Allāh any ally or any protector.

Translation: Saheeh International

Tafsir

And so just like that manner of revelation We have revealed it that is the Qur’ān as a decisive judgement in Arabic in the language of the Arabs for you to judge thereby between people. …

Excerpt from Tafsir al-Jalalayn, commentary on 13:37, via Quran.com. The reader has the full commentary and 9 more tafsirs.