Sunan At-Tirmidhi

Narrated Abu Hurairah:""A man was killed during the time of the Messenger of Allah (ﷺ), so the killer was brought to the man's guardian. The killer said: 'O Messenger of Allah! By Allah! I did not mean to kill him.' So the Messenger of Allah (ﷺ) said: 'Then if what he is saying is true, and you kill him, you would enter the Fire.' So he let the man go."" He said: ""His hands were bound behind him with a Nis'ah."" He said: ""So he left, dragging his Nis'ah."" [He said:] ""So he was called Dhan-Nis'ah