It is narrated from Humaid bin Hilal, he says: A man gathered me and Bishr bin Asim and related this matter from Sayyiduna Uqbah bin Malik (may Allah be pleased with him): The people of one of the expeditions of the Messenger of Allah (peace and blessings be upon him) reached the water-bearers in the morning. When one of them came out, a man from among the Muslims attacked him. He said in response that he was a Muslim, but the Muslim killed him. When these people returned and informed the Messenger of Allah (peace and blessings be upon him) of this, he (peace and blessings be upon him) stood up to address them, praised and glorified Allah, and then said: "As for what follows, what will be the state of that Muslim who kills a man who is saying that he is a Muslim?" That man said: "Yes, he said this to save himself." The Messenger of Allah (peace and blessings be upon him) turned his face away and extended his right hand. In one narration it is mentioned: The Messenger of Allah (peace and blessings be upon him) turned towards him and said: "Can you recognize evil on his face?" Then the Messenger of Allah (peace and blessings be upon him) said: "Whoever kills a Muslim, Allah has denied me concerning him." The Messenger of Allah (peace and blessings be upon him) repeated this sentence three times.