Allah's Messenger (ﷺ) stood up and said: By Him besides Whom there is no god but He, the blood of a Muslim who bears the testimony that there is no god but Allah, and I am His Messenger, may be lawfully shed only in case of three persons: the one who abandons Islam, and deserts the community [Ahmad, one of the narrators, is doubtful whether the Prophet (ﷺ) used the word li'l-jama'ah or al-jama'ah), and the married adulterer, and life for life.
Reference: Sahih Muslim 1676 c In-book : Book 28, Hadith 36 USC-MSA web (English) : Book 16, Hadith 4154 (deprecated)
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