The Prophet ﷺ said: If anyone is killed blindly or, when people are throwing stones, by a stone or a whip, his blood-wit is the blood-wit for an accidental murder. But if anyone is killed intentionally, retaliation is due. If anyone tries to prevent it, the curse of Allah, of angels, and of all the people will rest on him. (Using translation from Abū Dāʾūd 4591)   

مَنْ قُتِلَ فِي عِمِّيَّةٍ أَوْ رِمِّيَّةٍ بِحَجَرٍ أَوْ بِسَوْطٍ أَوْ عَصًا فَعَقْلُهُ عَقْلُ الْخَطَأِ وَمَنْ قُتِلَ عَمْدًا فَهُوَ قَوَدٌ وَمَنْ حَالَ بَيْنَهُ وَبَيْنَهُ فَعَلَيْهِ لَعْنَةُ اللهِ وَالْمَلَائِكَةِ وَالنَّاسِ أَجْمَعِينَ لَا يُقْبَلُ مِنْهُ صَرْفٌ وَلَا عَدْلٌ