From the Washington Examiner:
The Islamic State's religious scholars have ruled that taking the organs of non-Muslims is permissible under Islamic law to save the life of a Muslim, because killing apostates to eat their flesh has previously been allowed.
The news agency posted a U.S. government translation of the document attributed to the Islamic State's research and fatwa committee.
"Allah almighty knows what's best and knows what's right and what is wrong and there is evidence from texts and Islamic principles and laws supporting the notion that transplanting organs from an apostate's body into a Muslim body in order to save the latter's life or replace a damaged organ with it is permissible," the document reads.
It must be very liberating to divide the world into believers and unbelievers, such that one may do whatever one likes to the unbelievers. That works well up until the point at which those pesky unbelievers strike back and start serving up believer burgers.