The Quran-
"2.190. Fight against those who fight against you in the way of Allah, but do not transgress, for Allah does not love transgressors.

2.191. Kill them whenever you confront them and drive them out from where they drove you out. (For though killing is sinful) wrongful persecution is even worse than killing. Do not fight against them near the Holy Mosque unless they fight against you; but if they fight against you kill them, for that is the reward of such unbelievers.

2.192. Then if they desist, know well that Allah is Ever-Forgiving, Most Compassionate.

2.193. Keep on fighting against them until mischief ends and the way prescribed by Allah prevails. But if they desist, then know that hostility is only against the wrong-doers.

2.194. For the sacred month; sanctities should be respected alike ( by all concerned). Thus, if someone has attacked you, attack him just as he attacked you, and fear Allah and remain conscious that Allah is with those who guard against violating the bounds set by Him."