Jihad
Jihad means "to strive or struggle," and is considered the "sixth pillar of Islam" by a minority of Muslim authorities. Within Islamic jurisprudence, jihad is usually taken to mean military exertion against non-Muslim combatants in the defense or expansion of the Islamic state, the ultimate purpose of which is to establish the universal domination of Islam. Jihad, the only form of warfare permissible in Islamic law, may be declared against non-Muslims who refuse to convert to Islam or submit to Islamic rule. Jihad is perpetual in nature; in theory, there can be no permanent peace with non-Muslim states, only truces which can be repudiated when circumstances become favorable for the resumption of hostilities. It ceases only when Jews, Christians, and Zoroastrians submit to the authority of Islam and agree to pay the jizya (a poll tax) and kharaj (a land tax), and when polytheists convert to Islam.
Under most circumstances and for most Muslims, jihad is a collective duty (fard kifaya): its performance by some individuals exempts the others. Only for those vested with authority, especially the sovereign (imam), does jihad become an individual duty. For the rest of the populace, this happens only in the case of a general mobilization. For most Shias, offensive jihad can only be declared by a divinely appointed leader of the Muslim community, and as such is suspended in his absence. Some Muslim authorities, especially among the Shi'a and Sufis, distinguish between the "greater jihad", which pertains to spiritual self-perfection, and the "lesser jihad", defined as warfare. Jihad also refers to one's striving to attain religious and moral perfection.
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