Musnad Ahmad Hadith 1402

"Uthman (رضي الله عنه) looked out at those who were besieging him. He greeted them with salam but they did not respond to him. "Uthman (رضي الله عنه) said: “Is Talhah among the people?” Talhah said: “Yes.” He said: “Verily, to Allah we belong and unto Him is our return! I greet people among whom you are and they do not return the greeting.” Talhah said: “I returned the greeting.” "Uthman said: “This is not the way to return the greeting, I made you hear me but you did not make me hear you. O Talhah, I adjure you by Allah, did you hear the Prophet (ﷺ) say: “The blood of a Muslim is not permissible except in one of three cases: if he disbelieves after believing, or he commits zina after having been married, or he kills a soul and may be killed in return.” Talhah said: “Yes, by Allah.” "Uthman said takbeer, then he said: “By Allah, I have never denied Allah since I came to know Him. I never committed zina during the Jahiliyyah or in Islam. I abstained during the Jahiliyyah because I hated it and in Islam so as to maintain my chastity. And I have never killed anyone in return for which killing me would become permissible.”