It is the general authority to undertake the establishment of religion through the revival of religious sciences, the establishment of the pillars of… - Shah Waliullah Dehlawi

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It is the general authority to undertake the establishment of religion through the revival of religious sciences, the establishment of the pillars of Islam, the organization of jihad and its related functions of maintenance of armies, financing the soldiers, and allocation of their rightful portions from the spoils of war, administration of justice, enforcement of [the limits ordained by Allah, including the punishment for crimes (hudud)], elimination of injustice, and enjoining good and forbidding evil, to be exercised on behalf of the Prophet… It is no mercy to them to stop at intellectually establishing the truth of Religion to them. Rather, true mercy towards them is to compel them so that Faith finds a way to their minds despite themselves. It is like a bitter medicine administered to a sick man. Moreover, there can be no compulsion without eliminating those who are a source of great harm or aggression, or liquidating their force, and capturing their riches, so as to render them incapable of posing any challenge to Religion. Thus their followers and progeny are able to enter the faith with free and conscious submission... Jihad made it possible for the early followers of Islam from the Muhajirun and the Ansar to be instrumental in the entry of the Quraysh and the people around them into the fold of Islam. Subsequently, God destined that Mesopotamia and Syria be conquered at their hands. Later on it was through the Muslims of these areas that God made the empires of the Persians and Romans to be subdued. And again, it was through the Muslims of these newly conquered realms that God actualized the conquests of India, Turkey and Sudan. In this way, the benefits of jihad multiply incessantly, and it becomes, in that respect, similar to creating an endowment, building inns and other kinds of recurring charities.… Jihad is an exercise replete with tremendous benefits for the Muslim community, and it is the instrument of jihad alone that can bring about their victory.… The supremacy of his Religion over all other religions cannot be realized without jihad and the necessary preparation for it, including the procurement of its instruments. Therefore, if the Prophet’s followers abandon jihad and pursue the tails of cows [that is, become farmers] they will soon be overcome by disgrace, and the people of other religions will overpower them.