Abu Umama b. Sahl b. Hunaif told that when ‘Uthman b. ‘Affan was besieged he looked down and said:I adjure you by God. Are you aware that God’s Messenger said, “It is not lawful to kill a man who is a Muslim except for one of three reasons: fornication after marriage, or unbelief after accepting Islam, or wrongfully killing someone, for which he may be killed”? I swear by God that I have not committed fornication before or after the coming of Islam, or apostatised since I swore allegiance to God's Messenger, or killed anyone whom God has declared inviolate; so for what reason do you want to kill me? Tirmidhi, Nasa'i and Ibn Majah transmitted it, and Darimi gives the wording of the tradition.
Hadith Referenceمشكوة المصابيح / كتاب القصاص / 3466
Hadith Gradingالألبانی:لم تتمّ دراسته | زبیر علی زئی:صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «صحيح، رواه الترمذي (2158 وقال: حسن) و النسائي (91/7. 92 ح 4024) و ابن ماجه (2533) والدارمي (171/2. 172 ح 2302 مختصرًا)»