Final answer:
Macbeth is speaking to the ghost of Banquo at the banquet, revealing his guilt and fear to the guests through his exclamations.
Step-by-step explanation:
During the banquet in Shakespeare's Macbeth, Macbeth is addressing his exclamations to the ghost of Banquo. Macbeth is the only one who can see this apparition, and his outburst causes alarm among the guests. The ghost's presence is a manifestation of Macbeth's guilt over ordering the murder of his friend Banquo. The statement reflects Macbeth's horror and denial of his own actions, as he commands the ghost to leave his sight and return to the grave where it belongs, emphasizing the lifelessness of the apparition with phrases such as "Thy bones are marrowless" and "thy blood is cold."