4:90Except those who join people with whom you have a treaty, or those who come to you reluctant to fight you or fight their own people. Had God willed, He would have given them power over you, and they would have fought you. If they withdraw from you, and do not fight you, and offer you peace, then God assigns no excuse for you against them.

4:91You will find others who want security from you, and security from their own people. But whenever they are tempted into civil discord, they plunge into it. So if they do not withdraw from you, nor offer you peace, nor restrain their hands, seize them and execute them wherever you find them. Against these, We have given you clear authorization.

4:94O you who believe! When you journey in the way of God, investigate, and do not say to him who offers you peace, “You are not a believer,” aspiring for the goods of this world. With God are abundant riches. You yourselves were like this before, and God bestowed favor on you; so investigate. God is well aware of what you do.