If the caliph becomes a non-Muslim, alters the Sacred Law- (N: such alteration being of two types, one of which consists of his changing the Law by legislating something which contravenes it while believing in the validity of the provisions of the Sacred Law, this being an injustice that does not permit rebellion against him, while the other consists of imposing rules that contravenes the provisions of the religion while believing in the validity of the rules he has imposed, this being unbelief (kufr) (A: it is questionable whether anyone would impose much rules without believing in their validity)