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An-Nawawy’s Forty Hadiths: (14) Value of Human Life
On the authority of Ibn Masood (may Allah be pleased with him) who said, "The Messenger of Allah (peace and blessings of Allah be upon him) said, 'It is not permissible to spill the blood of a Muslim except in three [instances]: The married person who commits adultery, a life for a life, and the one who forsakes his religion and separates from the community.” (Bukhari & Muslim)
