Yaseen - 36:70 It warns the living and exposes the disbelievers.
The Qur'an exposes the disbelievers:
The Pilgrimage/22:72 "You read disbelief on the faces of the disbelievers when Our clear Verses are recited to them. They will almost attack those who recite Our Verses to them. Say, "Shall I inform you of something worse than that? Fire! Allah has promised it to the disbelievers. What an evil consequence!"

Yaseen/36:69 We have not taught him poetry, nor is it fit for him. This is but a message and a clear Qur´an.
Yaseen/36:70 It warns the living and exposes the disbelievers.

The Night Journey/17:45 When you recite the Qur´an, We place between you and those who do not believe in the Hereafter an invisible barrier.
The Night Journey/17:46 And We put shells in their hearts and weights in their ears to prevent them from understanding it. When you remember your Lord only in the Qur´an, they turn back in hatred
The Night Journey/17:89 We have given all kinds of examples in this Qur´an, but the majority of the people persist in disbelief.

The Romans/30:58 "We have given every kind of example to the people in this Qur´an. If You bring them a miracle, the disbelievers will say, "You are the ones who were mistaken."

The Repentance/9:124 "Whenever a surah comes down, there are those who ask, "Which of you has this surah increased your faith?"Indeed it has increased the faith of the believers, and they rejoice and give glad tidings to one another."

The Night Journey/17:41 We have explained in the Qur´an that they may take admonition, but this only increases their hatred