Narrated 'Amr b. Shu'aib: On his father's authority said that his grandfather reported the Prophet (ﷺ) said: A believer will not be killed for an infidel. If anyone kills a man deliberately, he is to be handed over to the relatives of the one who has been killed. If they wish, they may kill, but if they wish, they may accept blood-wit

English translation · Sunan Abu Dawud