"Aishah said: 'Do you not know that the Messenger of Allah (ﷺ) said: It is not permissible to shed the blood of a Muslim, except a man who committed adultery after being married, or one who reverted to Kufr after becoming Muslim, or a life for a life.'"
Reference: Sunan an-Nasa'i 4017 In-book : Book 37, Hadith 52 English translation : Vol. 5, Book 37, Hadith 4022
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