The Table Spread - 5:95
Believers, do not kill game while you are in ihram. Whoever of you kills it intentionally, his punishment is that he should send to the Ka´bah as a sacrifice a domestic animal equal to it, to be decided by two just men from among you. Or he must feed the poor or fast the equivalent of it as a punishment. So that he may taste the punishment for what he has done. Allah has forgiven the past. Whoever does it again, Allah will take vengeance on him. Allah is the Exalted, the avenger.
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.