UDL: The Quran was Revealed in Arabic (II)

12:2 Indeed, We have sent it down as an Arabic Qur'an, so that you can use your intelligence.

39:28 An Arabic Qur'an, without any deviance that they might become conscious in the way Allah intends for you to be conscious.

Hadith on Quran: Allah’s words better than all other speech

Abu Sa’id reported: The Messenger of Allah, peace and blessings be upon him, said, “The superiority of the words of Allah over all other words is like the superiority of Allah over His creation.”

Source: Sunan al-Tirmidhī 2926