Sahih al-Bukhari Book 87, Hadith 15
A Jew crushed the head of a girl between two stones, and the girl was asked, "Who has done that to
you, so-and-so or so and so?" (Some names were mentioned for her) till the name of that Jew was
mentioned (whereupon she agreed). The Jew was brought to the Prophet (ﷺ) and the Prophet (ﷺ) kept on
questioning him till he confessed, whereupon his head was crushed with stones.
I went to help that man (i.e., `Ali), and on the way I met Abu Bakra who asked me, "Where are you going?" I replied, "I am going to help that man." He said, "Go back, for I heard Allah's Messenger (ﷺ) saying, 'If two Muslims meet each other with their swords then (both) the killer and the killed one are in the (Hell) Fire.' I said, 'O Allah's Messenger (ﷺ)! It is alright for the killer, but what about the killed one?' He said, 'The killed one was eager to kill his opponent."
A girl wearing ornaments, went out at Medina. Somebody struck her with a stone. She was brought to the Prophet (ﷺ) while she was still alive. Allah's Messenger (ﷺ) asked her, "Did such-and-such a person strike you?" She raised her head, denying that. He asked her a second time, saying, "Did so-and-so strike you?" She raised her head, denying that. He said for the third time, "Did so-and-so strike you?" She lowered her head, agreeing. Allah's Messenger (ﷺ) then sent for the killer and killed him between two stones.