Qur'an 22:39-40

To those against whom war is made, permission is given (to fight), because they are wronged;—and verily, Allah is most powerful for their aid;—(They are) those who have been expelled from their homes in defiance of right,—(for no cause) except that they say, our Lord is Allah. Did not Allah check one set of people by means of another, there would surely have been pulled down monasteries, churches, synagogues, and mosques, in which the name of Allah is commemorated in abundant measure. Allah will certainly aid those who aid his (cause);—for verily Allah is full of Strength, Exalted in Might, (able to enforce His Will).

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