It is narrated from Hazrat Uqbah bin Malik (may Allah be pleased with him) that one day the Prophet (peace and blessings be upon him) was delivering a sermon when a person said: O Messenger of Allah! By Allah, he uttered this word only to save his life. Then the narrator mentioned the complete hadith and said that the Prophet (peace and blessings be upon him) turned towards him, and on the blessed face of the Prophet (peace and blessings be upon him) were signs of grief and anger at that time, and he said three times: Allah Almighty has refused to accept my word in favor of the one who kills a Muslim.