Al Isra’ Ayah 33

وَلَا تَقْتُلُواْ ٱلنَّفْسَ ٱلَّتِى حَرَّمَ ٱللَّهُ إِلَّا بِٱلْحَقِّ‌ۗ وَمَن قُتِلَ مَظْلُومًا فَقَدْ جَعَلْنَا لِوَلِيِّهِۦ سُلْطَـٰنًا فَلَا يُسْرِف فِّى ٱلْقَتْلِ‌ۖ إِنَّهُۥ كَانَ مَنصُورًا ٣٣ Do not take a ?human? life—made sacred by Allah—except with ?legal? right. If anyone is killed unjustly, We have given their heirs the authority, but do not let them exceed limits in retaliation, for they are already supported ?by law?.