Az-Zumar · 39:23

23. Allah sent down to His Messenger, Muhammad (peace be upon him), the Qur’ān which is the best speech. He sent it down in a manner that part of it resembles other parts in their truthfulness, beauty and consistency without disagreement. It contains numerous stories and rulings, promises and threats, attributes of the people of truth, attributes of the people of falsehood etc. The skins of those who are in awe of their Lord tremble when they hear the threats and warnings it contains. Then their skins and their hearts soften to Allah’s remembrance when they hear the hope and good news it contains. What has been mentioned, about the Qur’ān and its effect, is Allah’s guidance by which He guides whoever He wills. Those whom Allah leaves astray and does not guide, have no one to guide them.