They ask you with regard to fighting in the Sacred Month. Say, `Fighting in it is (a) grave (offence). But to bar (people) from Allâh's cause and disbelief in Him and (to hinder people from) the Holy Mosque and to turn out its people therefrom is still grave in the sight of Allâh, and persecution is all the more grave an offence than killing.' And they will not cease to fight you until they turn you back from your faith if they can. And whoso from amongst you turns back from his faith, and dies while he is a disbeliever, it is they, then, whose deeds go in vain in this world and the Hereafter; and it is they who are the fellows of the Fire and therein they shall abide for long. - Quran 2:217