EXOD575 Dispensation to intervene in the natural order is derived from [this verse]; but once such license is given, medical therapy is not simply elective but acquires the status of a positive obligation. Sanhedrin 73a, this obligation mandates not only the rendering of personal assistance as is the case with regard to the restoration of lost property, but, by virtue of the negative commandant, "You shall not stand idly by the blood of your neighbor"(Leviticus 19:16), the obligation is expanded to encompass expenditure of financial resources for the sake of preserving the life of one's fellowman.