Shirk is to assign to other than Allah a share in that which is exclusively His right — whether in His Lordship, in worship, or in His Names and Attributes. Major shirk (ash-shirk al-akbar) takes a person outside the fold of Islam and renders all of his deeds void if he dies upon it; it includes du''a to other than Allah, slaughter for other than Allah, and seeking benefit or warding off harm from the dead. Minor shirk (ash-shirk al-asghar) — such as ar-riya'' (showing off in worship) and swearing by other than Allah — does not expel from Islam but is among the gravest of major sins. Shirk is forbidden because it is the greatest injustice (Luqman 31:13): the servant directs to a powerless creation what is the right of his All-Powerful Creator. Allah forgives every sin for whom He wills upon repentance, but does not forgive that He be associated with partners while the person dies upon it (an-Nisa'' 4:48).