Surah Al-Isra, ayah 33

وَلَا تَقۡتُلُواْ ٱلنَّفۡسَ ٱلَّتِي حَرَّمَ ٱللَّهُ إِلَّا بِٱلۡحَقِّۗ وَمَن قُتِلَ مَظۡلُومٗا فَقَدۡ جَعَلۡنَا لِوَلِيِّهِۦ سُلۡطَٰنٗا فَلَا يُسۡرِف فِّي ٱلۡقَتۡلِۖ إِنَّهُۥ كَانَ مَنصُورٗا ٣٣

Walā taqtulun-nafsal-latī harramallāhu illā bil-haqqi waman qutila mazlūman faqad ja'alnā liwaliyyihī sultānan falā yusrif fil-qatli innahū kāna mansūrā

And do not kill the soul [i.e., person] which Allāh has forbidden, except by right.⁷⁴² And whoever is killed unjustly - We have given his heir authority,⁷⁴³ but let him not exceed limits in [the matter of] taking life. Indeed, he has been supported [by the law].