Answer:
The ghost of Hamlet's father instructs him no to do any harm to his mother.
Explanation:
During Act 1, Scene 5 of the play "Hamlet" , by William Shakespeare, the ghost of Hamlet's father appears to Hamlet and reveals the gruesome details of the circumstances of his death. While the ghost instructs Hamlet to take revenge on current king Claudius for his murder, he also tells him to refrain himself from doing any harm to his mother, Gertrude, by telling him to "Leave her to heaven and to those thorns that in her bosom lodge to pick and sting her."
This way, the ghost tells Hamlet to leave his mother's judgement to heaven and to her own guilt.
