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What are the rules of war in Islam?

Short answerWar in Islam is restricted: it is only to defend life and faith or to repel injustice. Civilians may not be attacked, the killing of women, children, the elderly and monks is forbidden, as are mutilating bodies and destroying crops and trees without need. Whoever seeks peace is answered with peace.

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The Quranic rule

Quran
وَقَٰتِلُواْ فِي سَبِيلِ ٱللَّهِ ٱلَّذِينَ يُقَٰتِلُونَكُمۡ وَلَا تَعۡتَدُوٓاْۚ إِنَّ ٱللَّهَ لَا يُحِبُّ ٱلۡمُعۡتَدِينَ

Fight in the way of Allāh those who fight against you but do not transgress. Indeed, Allāh does not like transgressors.

Al-Baqarah 2:190
Quran
۞ وَإِن جَنَحُواْ لِلسَّلۡمِ فَٱجۡنَحۡ لَهَا وَتَوَكَّلۡ عَلَى ٱللَّهِۚ إِنَّهُۥ هُوَ ٱلسَّمِيعُ ٱلۡعَلِيمُ

And if they incline to peace, then incline to it [also] and rely upon Allāh. Indeed, it is He who is the Hearing, the Knowing.

Al-Anfal 8:61

The Prophet’s instructions

Hadith
نَهَى النَّبِيُّ ﷺ عَنْ قَتْلِ النِّسَاءِ وَالصِّبْيَانِ

The Prophet ﷺ forbade the killing of women and children.

Ibn Umar · Al-Bukhari, Muslim

Among the instructions of Abu Bakr to the Muslim army were not to kill a child, an old man or a woman, not to cut down fruit-bearing trees, not to slaughter a sheep except for food, and to leave the monks to what they had devoted themselves to. Reported by Malik in al-Muwatta.

Frequently asked questions

Is jihad a war against non-Muslims?

Jihad is broader than fighting, and lawful fighting is bound by the rules above; see the page on the meaning of jihad.

Quran text and translations: QuranEnc. Hadith translations: HadeethEnc. Sources are shown on each item. Found a mistake? Tell us.