According to search-discovered classical Islamic scholarship, the principle of Qisas (قصاص), or 'retribution in kind,' is a legal framework for justice concerning murder and bodily harm, famously articulated in the Quranic dictum 'a life for a life, an eye for an eye' (Quran 5:45). Classical jurists like Al-Qurtubi explain that Qisas is not a mandate for revenge but a legal right for the victim or their heirs, to be administered strictly by a legitimate state authority under rigorous conditions, such as proof of intent and equality between parties. The profound wisdom of this law, as Ibn Kathir elaborates on Quran 2:179, lies in its power as a deterrent, which ultimately saves lives by preventing crime. However, a crucial and universally emphasized aspect of this law is the divine encouragement to forgo retribution. The victim's party is given the superior options of either accepting Diyah (monetary compensation) or offering a complete pardon, which the Quran describes as an act of charity and an expiation for sins. This synthesis establishes Qisas as a system of perfect justice balanced by the highest virtue of mercy.