The protection of human life and the sanctity of blood are foundational principles in Islamic law. Islam strictly prohibits unlawful aggression against individuals residing in Islamic territories (Dār al-Islām). However, under certain conditions, specific actions by Muslims or residents of these lands may lead to the loss of personal inviolability (ʿiṣmah), rendering their blood unprotected. Islamic jurisprudence has extensively detailed such circumstances. The permissibility of shedding blood in these rare cases may apply either generally to all Muslims, or in limited contexts, to specific individuals. This concept is closely tied to legal debates concerning the scope and conditions of being deemed Mahdūr al-Damm. Shiite jurists unanimously agree that individuals who insult the Prophet or the infallible Imams are considered Mahdūr al-Damm (One Whose Blood Is Not Legally Protected) absolutely, regardless of interpretations regarding whether killing them is obligatory or merely permitted. In contrast, when a man encounters his wife in the act of adultery with a stranger (Zinā with an Ajnabī — meaning an illicit sexual act with a non-maḥram man), jurists allow the husband or a defender to commit homicide under specific circumstances. This is a case of relative Mahdūr al-Damm where the permissibility applies only to designated individuals. However, regarding the woman involved—if she meets the conditions of Iḥṣān (Legal Marital Protection, which includes being an adult, sane, free, and having had lawful sexual relations within marriage)—there is no definitive legal evidence to classify her as Mahdūr al-Damm. The only exception, based on select narrations (if accepted in both authenticity and legal relevance), may allow exemption from qiṣāṣ (retaliation punishment) for a man who kills someone found in adultery with his wife—provided he presents four reliable eyewitnesses to the act. If such witnesses are not presented, the killer becomes liable under qiṣāṣ. Among Sunni jurists, there is no cohesive or well-supported legal position that permits the killing of the adulterous woman (Muḥṣanah - Legally Married Woman with Protective Status) and her partner during the act of adultery.