Lady Aisha (may Allah be pleased with her) narrates: On the hilt of the sword of the Noble Prophet (peace and blessings be upon him) were found these two statements: "The most disobedient person on earth is the one who kills someone other than his killer (the narrator is in doubt, perhaps the words are:) who kills someone other than the one who killed him, and the person who attributes himself to someone other than his master; whoever does this has, as if, denied Allah and His Messenger. Allah will not accept any obligatory or voluntary act of worship from such a person. (The second statement is:) The life of the believers is of equal value, and the protection granted by any common individual among them must be respected. No Muslim will be killed in retaliation for a disbeliever, nor will any covenant-holder (dhimmi) be killed, and people of two different religions will not inherit from each other." (This narration is brief.)