Prophet Jonah - 10:98
The people of Jonah would have been an exception to this, even if there had been a people whose belief did not benefit them; when they believed, We removed from them the humiliating torment of this worldly life, and We made them live in blessings for a while.
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.