Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:12:2 –

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

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.
القرآن:١٢:٢ –

إِنَّا أَنْزَلْنَاهُ قُرْآنًا عَرَبِيًّا لَعَلَّكُمْ تَعْقِلُونَ  

{إنا أنزلناه قرآنا عربيا} بلغة العرب {لعلكم} يا أهل مكة {تعقلون} تفقهون معانيه.

See similar narrations below:

Collected by Qurʾān
quran:43:3 –

Indeed, We have made it an Arabic Qur'an that you might understand.  

Lo! We have made it, We have brought the Book into existence ˹as˺, an Arabic Qur’ān, in the language of the Arabs, that perhaps you, O people of Mecca, may understand, ˹that you may˺ comprehend its meanings.
القرآن:٤٣:٣ –

إِنَّا جَعَلْنَاهُ قُرْآنًا عَرَبِيًّا لَعَلَّكُمْ تَعْقِلُونَ  

{إنا جعلناه} أوجدنا الكتاب {قرآنا عربيا} بلغة العرب {لعلكم} يا أهل مكة {تعقلون} تفهمون معانيه.