What does the ghost tell Hamlet?

Alone with Hamlet, the ghost finally speaks. He tells Hamlet that he has come on a nightly walk from Purgatory, where his soul is under continual torment for the sins of his life. The ghost then reveals that he was not killed by a viper, as officially announced, but was murdered. Moreover, he reveals that his own brother, Claudius, who now wears his crown and sleeps with his wife, was the murderer. The ghost tells of how Claudius snuck into his garden while he was taking his accustomed afternoon nap and poured poison into his ear, killing him most painfully and sending his soul unpurified into the afterlife. The ghost demands vengeance, telling Hamlet not to plot against his mother, whom he describes as merely weak and lustful, but to focus the whole of his revenge on Claudius. The ghost then disappears.