The Women - 4:115
Whoever disobeys the messenger after the right way has become clear to him and takes a way other than the way of the believers, We will turn him in the direction he chose and We will cast him into Hell. What an evil place of return.
The most important criterion of belief:
The Cattle/6:82
Those who believe and do not mix their faith with wrongdoing, they deserve security and they have found the truth.
Luqman/31:13
"When Lokman advised his son, he said: "My dear son, do not associate partners with Allah; surely shirk (associating partners with God) is a great wrong."
The Companies/39:65
It has been revealed to you and those before you that if you associate partners, all that you do will be in vain and you will be of the losers.