that the Messenger of Allah (ﷺ) said: "The blood of a Muslim man, who testifies that none has the right to be worshipped Allah, is not lawful except for one of three cases: The (previously married or) married adulterer, a life for a life, and the one who leaves the religion and parts from the Jama'ah (the community of Muslims.)
Reference: Jami` at-Tirmidhi 1402 In-book : Book 16, Hadith 18 English translation : Vol. 3, Book 14, Hadith 1402
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