The Messenger of Allah (ﷺ) said: "It is not permissible to shed the blood of a Muslim except in three cases: An adulterer who had been married, who should be stoned to death; a man who killed another man intentionally, who should be killed; and a man who left Islam and waged war against Allah, the Might and Sublime, and His Messenger, who should be killed, or crucified, or banished from the land."
Reference: Sunan an-Nasa'i 4048 In-book : Book 37, Hadith 83 English translation : Vol. 5, Book 37, Hadith 4053
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