(4) The enemies of Islam who attack in order to destroy the...
(4) The enemies of Islam who attack in order to destroy the very foundation of Islam or to overthrow the Islamic Government: In this case, it is wajib for all Muslims to defend Islam and to deal with them like kafir harbi (unbeliever to be fought against).
If it is deemed advisable in the interests of the Muslims and Islam, the Islamic society can temporarily enter into a non-aggression treaty with the enemies of Islam, but it does not have the right to establish friendly relations with them in a manner that their words and actions cause evil effects and corrupt the thoughts and deeds of Muslims.
ESCAPING FROM JIHAD AND DEFENCE Running away from the battlefield and escaping from the enemy means that the person who runs away considers his life as more valuable and dearer than the existence of the society. It is indeed the surrender of religious sanctities and the life, honour, and property of the society to an enemy who threatens their lives in all respects. Therefore, escaping from jihad and defence is a mortal sin.
The Almighty Allah has explicitly promised to put the person who escapes from jihad in hell as He states: "And whoever shall turn his back to them on that day unless he shall turn aside for the sake of fighting or withdraws to a company - then he, indeed, becomes deserving of Allah's wrath, and his abode is hell...(8:16)." DEFENDING THE ISLAMIC DOMAIN According to what has been discussed, defending the Islamic society and the territory of Muslims is one of the most important Islamic obligations.
The Almighty Allah states: "And do not speak of those who are killed in Allah's way as dead; nay, (they are) alive, but you do not perceive (2:154)". The story of men who most heartily participated in bloody battles during early period of the advent of Islam and of martyrs who got weltered in their pure blood is extremely astonishing as well as exemplary. These were the ones who established and made firm foundation of this holy religion with their pure blood and severely injured bodies.
FIGHTING WITH THE INTERNAL ENEMIES OF THE SOCIETY As according to natural logic, we ought to fight the foreign enemies and defend the society from damages, we should combat and fight the internal enemies of the society as well. The internal enemy of the society is one who breaches the general policies and the rules that are in force and thus disrupts and deranges the general order of the society.