Defensive Jihad: Turning Expansion into Self-Defense

Islam divides armed jihad into two categories: the first is offensive jihad: the war to expand the territory of Islam, to carry the faith into the lands of unbelief and bring them under the rule of Allah. The jurists classified this as fard kifaya, a collective obligation. A collective obligation rests on the community as a whole, not on each person, and it is discharged when a sufficient number fulfill it on everyone’s behalf.

Offensive jihad worked the same way. It was a standing duty of the Muslim state, not a personal duty of the Muslim man. And because it was the state’s war, it could be declared only by the state’s legitimate authority, the caliph, the imam, the holder of public power. An individual could not wake up and launch the expansion of Islam any more than a private citizen can declare war on a neighboring country.

The second category is defensive jihad: the war to repel an enemy who has invaded Muslim land. This the jurists classified as fard ayn, an individual obligation. When the unbeliever crosses into Muslim territory, the duty to fight falls personally on every able Muslim in the vicinity.

Defensive jihad, being a personal emergency like the duty to pray or to put out a fire in your house, requires no permission from anyone. No caliph need declare it or authorize it. The attack itself is the authorization.