War, Islam, and the Sanctity of Life: Non-Aggression in the Islamic Code of Combat
By Hassan Shibly

What does Islam say about war and how it should be conducted? This publication covers the rules of engaging in war as outline in Islamic scholarly tradition.
Introduction
The Principle of Non-Aggression
This statement became one of the essential “five maxims” that govern all actions in Islamic law.
Every action that causes harm to another person or animal is forbidden by default, unless it is taken to secure a greater benefit or repel a greater harm according to the subsidiary principle, “Greater harm is removed by lesser harm.”
It is forbidden in Islam to remove a lesser harm with a greater harm.
The persecution condemned by this verse refers to the Quraish who violently suppressed the practice of Islam, preventing people from performing pilgrimage at the Sacred Mosque in Mecca and driving Muslims out of their homes for no reason other than their beliefs. War, which involves killing, is certainly an evil, but the evil of this religious persecution was greater. Persecution at that time involved the violent curtailment of freedom to practice faith and systematic violent oppression of the poor and weak. Islamic just war was instituted to ensure Muslims would not have to endure the same suffering as that of their predecessors.
It is only in this sense that the verse, “Fight in God’s cause against those who fight you,”
was claimed by some jurists to be “abrogated” by the “verse of the sword.” As explained by the exegete Al-Badawi, the latter verses authorized war against “those who fight you or from whom that is expected.”
The principle of non-aggression itself was not abrogated or canceled, but rather Muslims were commanded to take the initiative against actual threats to their safety, namely the Roman and Persian empires, instead of waiting to be attacked in their own lands.
He exempted all categories of people from aggression except for the “people of combat and obstruction,” that is, those who attack Muslims or who violently prevent them from practicing their religion. Non-combatants such as women, children, monks, elders, the blind, and others may not be attacked unless they join the war effort.
Justice in War (Jus in Bello)
Fight in God’s cause against those who fight you, but do not overstep the limits: God does not love those who overstep the limits.
However, when it became necessary for Muslims to fight back against aggression, lest they be killed, this verse was revealed commanding the Muslims to go to war. From this verse, many critical Islamic rules of engagement are derived.
Islam complements this argument. Muslim jurists have derived from the above verse that it is impermissible to kill those not engaged in the actual fighting, especially women, children, the elderly, priests, monks, the handicapped, and even laborers or farmers who work for the enemy but are not directly involved in the fighting.
You will find a people who claim to have totally given themselves to God. Leave them to what they claim to have given themselves… Do not kill women or children or an aged, infirm person. Do not cut down fruit-bearing trees. Do not destroy an inhabited place. Do not slaughter sheep or camels except for food. Do not burn bees and do not scatter them. Do not steal from the spoils, and do not be cowardly.
The Prophet ﷺ himself set this precedent in a number of his actions and directives. On one occasion, after a woman was found to have been killed in the battle, the Prophet ﷺ “condemned” the killing of women and children.In another narration, the Prophet ﷺ explained his condemnation by saying, “She was not fighting,” demonstrating non-combatant immunity, and he further commanded his companions not to kill workers.
The message of non-aggression was even written on the Prophet ﷺ’s sword as a reminder to all, “Verily, the worst of people in insolence are those who strike at whoever did not strike them, a man who kills those who did not fight him.”
There are many narrations and traditions like these that emphasize protecting the lives of civilians and noncombatants.
In light of this principle, an additional rule of engagement must be emphasized: Transgressing the limits is prohibited.On the battlefield, the old, the weak, women, children, monks, laborers, and other civilians cannot be targeted unless they forfeit that immunity by fighting themselves. Even then, force is authorized only in proportion to the threat, so killing them should be avoided if at all possible.Two more rules outlaw cruelty against combatants and destruction of property: 1) Mutilation and torture are prohibited; and 2) Destruction of crops, trees, livestock or civilian infrastructure is not permissible except in certain limited circumstances (explored later on).These very principles were affirmed by Article 3 of the Cairo Declaration of Human Rights, issued and adopted at the Nineteenth Islamic Conference of Foreign Ministers in Cairo in 1990, which was based on traditional Sharia (or principles of Islamic Law):a) In the event of the use of force and in case of armed conflict, it is not permissible to kill non-belligerents such as old men, women and children. The wounded and the sick shall have the right to medical treatment; and prisoners of war shall have the right to be fed, sheltered, and clothed. It is prohibited to mutilate dead bodies. It is a duty to exchange prisoners of war and to arrange visits or reunions of the families separated by the circumstances of war.
b) It is prohibited to fell trees, to damage crops or livestock, and to destroy the enemy’s civilian buildings and installations by shelling, blasting or any other means.