The Family Of Imran - 3:118
Believers, do not take as confidants those who do not hold back from doing evil to you and who wish you to be in distress. Their mouths overflow with hatred and malice. Greater is that which they conceal in their breasts. We have explained the verses to you, if you reflect,
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.