When I went to the Me’raj (the ascension to the Heavens), I entered Heaven, and there I saw a palace made of white pearls, the door of that palace was decorated with pearls and rubies, and on that door was hanging a curtain. I raised my head towards it and saw written on the door: ‘There is no god, except Allah, Muhammad is the Messenger of Allah, Ali is the Guardian of the Ummah.’