The Cattle - 6:51 Warn with it (the Qur´an) those who are filled with the excitement of their coming before their Lord: They have no owner and no intercessor (intermediary) except Him. Perhaps they will be protected.
Related:
The Cattle/6:19 "Ask: "Whose testimony is the greatest?"Say: "Allah is the witness between me and you. I have been given this Qur´an to warn you and all those to whom it reaches. Do you bear witness that there is another god besides Allah?"Say: "I do not bear witness to that,"and then say: "He is the only God, and I am far from that which you associate partners with."
The Cattle/6:70 Leave those who take their religion as a pastime and are deceived by the life of this world. Remind them with this (the Qur´an) so that a person may not suffer the disastrous consequences of what he has earned. He has no Owner and intercessor except Allah. Even if he gives any ransom, it will not be accepted from him. These are the ones who suffer the disastrous consequences of what they have earned; they deserve a drink of boiling water and a painful torment because of their disbelief.

The Heights/7:3 Follow what has been sent down to you from your Lord, and do not follow others besides Him as your friends. How little do you take admonition!