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."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يُقْتَلُ مُسْلِمٌ بِكَافِرٍ وَبِهَذَا الإِسْنَادِ عَنِ النَّبِيِّ ﷺ قَالَ دِيَةُ عَقْلِ الْكَافِرِ نِصْفُ دِيَةِ عَقْلِ الْمُؤْمِنِ