Al Baqarah Ayah 190

وَقَـٰتِلُواْ فِى سَبِيلِ ٱللَّهِ ٱلَّذِينَ يُقَـٰتِلُونَكُمْ وَلَا تَعْتَدُوٓاْ‌ۚ إِنَّ ٱللَّهَ لَا يُحِبُّ ٱلْمُعْتَدِينَ ١٩٠ Fight in the cause of Allah ?only? against those who wage war against you, but do not exceed the limits. Allah does not like transgressors.