Surah Yusuf 12:2

إِنَّآ أَنزَلْنَـٰهُ قُرْءَٰنًا عَرَبِيًّا لَّعَلَّكُمْ تَعْقِلُونَ

Indeed, We have sent it down as an Arabic Qur’ān that you might understand.

Translation: Saheeh International

Tafsir

We have revealed it as an Arabic Qur’ān in the language of the Arabs so that you O people of Mecca might understand comprehend its meaning.

Excerpt from Tafsir al-Jalalayn, commentary on 12:2, via Quran.com. The reader has the full commentary and 9 more tafsirs.