Surah Al-Isra Verse 33 - English Translation by George Sale
Surah Al-Israوَلَا تَقۡتُلُواْ ٱلنَّفۡسَ ٱلَّتِي حَرَّمَ ٱللَّهُ إِلَّا بِٱلۡحَقِّۗ وَمَن قُتِلَ مَظۡلُومٗا فَقَدۡ جَعَلۡنَا لِوَلِيِّهِۦ سُلۡطَٰنٗا فَلَا يُسۡرِف فِّي ٱلۡقَتۡلِۖ إِنَّهُۥ كَانَ مَنصُورٗا
Neither slay the soul which God hath forbidden you to slay, unless for a just cause; and whosoever shall be slain unjustly, We have given his heir power to demand satisfaction; but let him not exceed the bounds of moderation in putting to death the murderer in too cruel a manner, or by revenging his friend's blood on any other than the person who killed him; since he is assisted by this law