The Pleading Woman - 58:11
"O you who believe, when you are told, "Make room,"make room so that Allah may make room for you. And when you are told, "Arise,"arise, so that Allah may raise those among you who believe and those who have been given knowledge. Allah is aware of all that you do."
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.