Hazrat Tha'laba narrates that Hazrat Muqatil bin Hayyan said: The language of the inhabitants of the heavens is Arabic. Then he recited this verse: Ha Meem. By the Book that makes things clear, We have made it an Arabic Qur'an so that you may understand. And this Qur'an is, with Us, in the Preserved Tablet, highly exalted and full of wisdom.