But Q.2:240 makes no mention of a waiting period before marriage, but only financial provisions ("maintenance and residence", aka "matāʿ") for widows. This "did" conflict with "the details of the rules to govern inheritances laboriously worked out in the fiqh", (according to non-Muslim critic and scholar John Burton). Burton argues that protecting established fiqh rulings from the contradiction of Quranic verses such as Q.2:240 (and not addressing conflicts between different lines of revelation) was what motivated the usulis who developed the theory of naskh.