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The Messenger of Allah ﷺ wrote to the Jews: A slain man has been found amongnst you, so pay his bloodwit.
I heard the Messenger of Allah ﷺ say: It is not lawful to kill a man who is a Muslim except for one of the three reasons: Kufr disbelief after accepting Islam, fornication after marriage, or wrongfully killing someone, for which he may be killed.