The Table Spread - 5:5
Today good and pure things have been made lawful for you. The food of the people of the Book is lawful for you. And your food is lawful for them. And it is lawful for you to marry chaste women from among the believers and chaste women from among those who were given the Book before you, provided that you pay them their marriage-money and do not commit adultery and do not keep secret friends. And whoever refuses to believe, all that he has done has been in vain, and he is of the losers in the Hereafter.
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.