Musnad Abu Ya'la al-Mawsili 154:102

Abu Khaythama narrated to us, Abu al-Mundhir Isma'il ibn 'Umar narrated to us, Sufyan narrated to us, from 'Awn ibn Abi Juhayfah, from 'Abd al-Rahman ibn Samurah, that Ibn 'Umar saw some people and said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Is one of you unable, when a man comes to him wanting to kill him, to be like the son of Adam? The killer is in the Fire, and the killed is in Paradise."