Sunan At-Tirmidhi

Narrated 'Amr bin Shu'aib:from his father, from his grandfather that the Messenger of Allah (ﷺ) said: ""The Muslim is not killed for disbeliever."" And with this chain, it has been narrated that the Prophet (ﷺ) said: ""The blood-money paid for disbeliever is half of the blood-money paid for a believer