The Prophet ﷺ said: Then you, Khuza'ah, have killed this man of Hudhayl, but I will pay his blood-wit. After these words of mine if a man of anyone is killed, his people will have a choice to accept blood-wit or to kill him.  

قَالَ رَسُولُ اللَّهِ ﷺ أَلاَ إِنَّكُمْ يَا مَعْشَرَ خُزَاعَةَ قَتَلْتُمْ هَذَا الْقَتِيلَ مِنْ هُذَيْلٍ وَإِنِّي عَاقِلُهُ فَمَنْ قُتِلَ لَهُ بَعْدَ مَقَالَتِي هَذِهِ قَتِيلٌ فَأَهْلُهُ بَيْنَ خِيرَتَيْنِ أَنْ يَأْخُذُوا الْعَقْلَ أَوْ يَقْتُلُوا  

When Mecca was conquered, the Messenger of Allah ﷺ got up and said: If a relative of anyone is killed, he will have a choice between two : he (the slayer) will either pay the blood-wit or he will be killed. A man of the Yemen called Abu Shah stood up and said: Write for me, Messenger of Allah. The narrator al-'Abbas (b. al-Walid) said: Write to me, (you people). The Messenger of Allah ﷺ said: Write (you people), for Abu Shah. These are the wordings of the tradition of Ahmad. Abu Dawud said: Write (you people), for me, that is, the address of the Prophet ﷺ.  

لَمَّا فُتِحَتْ مَكَّةُ قَامَ رَسُولُ اللَّهِ ﷺ فَقَالَ مَنْ قُتِلَ لَهُ قَتِيلٌ فَهُوَ بِخَيْرِ النَّظَرَيْنِ إِمَّا أَنْ يُودَى أَوْ يُقَادَ فَقَامَ رَجُلٌ مِنْ أَهْلِ الْيَمَنِ يُقَالُ لَهُ أَبُو شَاهٍ فَقَالَ يَا رَسُولَ اللَّهِ اكْتُبْ لِي قَالَ الْعَبَّاسُ اكْتُبُوا لِي فَقَالَ رَسُولُ اللَّهِ ﷺ اكْتُبُوا لأَبِي شَاهٍ وَهَذَا لَفْظُ حَدِيثِ أَحْمَدَ  

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  

عَنِ النَّبِيِّ ﷺ قَالَ لاَ يُقْتَلُ مُؤْمِنٌ بِكَافِرٍ وَمَنْ قَتَلَ مُؤْمِنًا مُتَعَمِّدًا دُفِعَ إِلَى أَوْلِيَاءِ الْمَقْتُولِ فَإِنْ شَاءُوا قَتَلُوهُ وَإِنْ شَاءُوا أَخَذُوا الدِّيَةَ