Odin could not contain his anger at his son. The Allfather was enraged. He told Thor that he was a vain, greedy, cruel boy. Thor retorted that his father was an old man and a fool. Odin agreed that he had been a fool—to think Thor was ready for the throne of Asgard. He told Thor that he was unworthy of the Realm of Asgard, unworthy of his title. Odin stripped Thor of his armor, his title, and his hammer, all of which would be returned to Thor if he proved himself worthy.
And then Odin, in all his rage screamed, “In the name of my father and of his father before, I cast you out!” He then uttered an incantation that would forever change not only his son, but Asgard and Midgard as well: “Whosoever holds this hammer, if he be worthy, shall possess the power of Thor.”