Tafsir of At-Takweer 81:18

And by the day when it Tanaffas. Ad-Dahhak said, "When it rises.'' Qatadah said, "When it brightens and advances.'' Jibril descended with the Qur'an and it is not the Result of Insanity Concerning Allah's statement,

إنه لقول رسول كريم