Wikipedia
Qisas
Qiṣāṣ is an Islamic term meaning "retaliation in kind" or revenge, " eye for an eye", "nemesis" or retributive justice. It is a category of crimes in Islamic jurisprudence, where Sharia allows equal retaliation as the punishment. Qisas principle is available against the accused, to the victim or victim's heirs, when a Muslim is murdered, suffers bodily injury or suffers property damage. In the case of murder, Qisas means the right of a murder victim's nearest relative or Wali (legal guardian) to, if the court approves, take the life of the killer.
Qisas is one of several forms of punishment in Islamic Penal Law, others being Hudud, Diyya and Ta'zir.