What are the ethics of war in Islam?

Islamic teaching on warfare emphasizes strict limits on when and how force may be used, rejecting unrestrained violence even in legitimate conflict. The Quran permits fighting primarily in self-defense or against active persecution, stating, 'Fight in the way of Allah those who fight you, but do not transgress limits; indeed Allah does not like transgressors' (2:190), explicitly tying permission to fight to the presence of aggression and to proportionate conduct. Classical Islamic law, developed from Quranic principles and prophetic practice, prohibited targeting non-combatants, and early caliphs such as Abu Bakr instructed departing armies not to kill women, children, the elderly, or religious clergy, not to destroy crops or livestock beyond necessity, and not to harm those who had not taken up arms. Prisoners were to be treated humanely, with the Quran urging kindness toward captives even during a period of active conflict (76:8). These principles formed an early basis for what later thinkers describe as rules of engagement, distinguishing between combatants and civilians centuries before comparable modern international humanitarian law. Scholars differ on how such classical rulings should be applied to contemporary warfare, but the underlying commitment to restraint and protection of civilians remains a consistent and central theme.

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