"I heard the Messenger of Allah (ﷺ) say: 'It is not permissible to shed the blood of a Muslim except in three cases: A man who commits adultery after having married; or one who kills another person, who is to be killed; or who reverts to Kufr after having accepted Islam, who is to be killed.'"
Reference: Sunan an-Nasa'i 4058 In-book : Book 37, Hadith 93 English translation : Vol. 5, Book 37, Hadith 4063
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