18:13We relate to you their story in truth. They were youths who believed in their Lord, and We increased them in guidance.

18:29And say, “The truth is from your Lord. Whoever wills—let him believe. And whoever wills—let him disbelieve”. We have prepared for the unjust a Fire, whose curtains will hem them in. And when they cry for relief, they will be relieved with water like molten brass, which scalds the faces. What a miserable drink, and what a terrible place.

18:56We send the messengers only as deliverers of good news and warners. Those who disbelieve argue with false argument, in order to defeat the truth thereby. They take My Verses, and the warnings, for a joke.