It was narrated that Abu Barzah said: "I passed by Abu Bakr and he was furious with one of his companions. I said: 'O Khalifah of the Messenger of Allah, who is the one with whom you are furious?' He said: 'Why are you asking about him?' I said: 'I will strike his neck (kill him).' By Allah, the seriousness of what I said took away his anger. Then he said: 'That is not for anyone after Muhammad [SAW].'"