4.29 O ye who believe! Eat not up your property among yourselves in vanities: But let there be amongst you traffic and trade by mutual good-will: Nor kill (or destroy) yourselves: for verily Allah hath been to you Most Merciful!

4.92 Never should a believer kill a believer, except by mistake....

3.28 Let not the believers take for friends or helpers unbelievers rather than believers: if any do that, in nothing will there be help from Allah. except by way of precaution, that ye may guard yourselves from them. But Allah cautions you (to fear) Himself; for the final goal is to Allah.

4: 90. They wish that you should disbelieve as they have disbelieved, so that you may become alike. Take not, therefore, friends from among them, until they emigrate in the way of ALLAH. And if they turn away, then seize them and kill them wherever you find them; and take no friend nor helper from among them;
4: 91. Except those who are connected with a people between whom and you there is a pact, or those who come to you, while their hearts shrink from fighting you or fighting their own people. And if ALLAH had so pleased, HE could have given them power against you, then they would have surely fought you. So, if they keep aloof from you and fight you not, and make you an offer of peace, then ALLAH has allowed you no way of aggression against them.
4: 92. You will find others who desire to be secure from you and to be secure from their own people. Whenever they are made to revert to hostility, they fall headlong into it. Therefore, if they do not keep aloof from you nor offer you peace nor restrain their hands, then seize them and kill them, wherever you find them. Against these WE have given you clear authority.