The Family Of Imran - 3:140
If a hardship has touched you, a similar hardship has touched the enemy community. We turn over such days among the people so that Allah may distinguish the true believers and make some of you witnesses. Allah does not love the wrongdoers.
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.