"The Messenger of Allah (ﷺ) said: 'By the One besides Whom there is no other god, it is not permissible to shed the blood of a Muslim who bears witness to La ilaha illalla (there is none worthy of worship except Allah) and that I am the Messenger of Allah, except in three cases: One who leaves Islam and splits away from the Jama'ah, a person who has been married and then commits adultery, and a life for a life.'"
Reference: Sunan an-Nasa'i 4016 In-book : Book 37, Hadith 51 English translation : Vol. 5, Book 37, Hadith 4021
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