so fight in the cause of allah you are not held responsible except for yourself. and encourage the believers that perhaps allah will restrain the might of those who disbelieve. and allah is greater in might and stronger in punishment.
فقاتل في سبيل الله لا تكلف إلا نفسك وحرض المؤمنين عسى الله أن يكف بأس الذين كفروا والله أشد بأسا وأشد تنكيلا