Al-Kahf (The Cave)
Surah 18 · Verse 56
And We do not send the messengers but as conveyers of good news and warners. And those who are infidels dispute, (basing their argument) on falsehood, in order to weaken thereby the truth, and they take My signs and that with which they are warned, as mockery.
Messengers of Allah (SWT) convey the good news of paradise and warn against hell. Infidels try to weaken the truth sent by Allah (SWT) by basing their arguments on falsehood and ridiculing the warning.



