Encyclopedia of Prophetic Hadiths

"When two Muslims meet to fight each other with their swords, both the killer and the killed are doomed to Hellfire." I said: "O Messenger of Allah, that is the case with the killer, but what about the killed one?" He said: "Indeed, he was keen to kill his companion."

"Shall I inform you of the gravest of the major sins?" He repeated this three times. They said: "Yes, O Messenger of Allah." He said: "Associating partners with Allah and undutifulness to parents." He was reclining and then sat up and said: "And indeed, the false statement." He repeated it so many times that we wished he would stop.