Surah Az-Zumar 39:28

قُرْءَانًا عَرَبِيًّا غَيْرَ ذِى عِوَجٍ لَّعَلَّهُمْ يَتَّقُونَ

[It is] an Arabic Qur’ān, without any deviance that they might become righteous.

Translation: Saheeh International

Tafsir

an Arabic Qur’ān qur’ānan ‘arabiyyan a circumstantial qualifier for emphasis without any deviation that is without any contradiction or variance that perhaps they may guard themselves against disbelief.

Excerpt from Tafsir al-Jalalayn, commentary on 39:28, via Quran.com. The reader has the full commentary and 9 more tafsirs.