"Your highness' part is to receive our duties, and our duties are to your throne and state, children and servants, which do but what they should, by doing every thing safe toward your love and honour."
Duncan
Macbeth believes that his hands will never be clean because the blood of King Duncan stains them.
Macbeth's doubts were about the consequences of his deeds in this world. There was also doubt about the deed from his obligations as kinsman and host of Duncan.
In Act 1, Scene 2 of Macbeth, the Captain describes Macbeth as "brave Macbeth" and "Bellona's bridegroom," highlighting his courage and honor in battle. Additionally, King Duncan praises Macbeth as a "valiant cousin" and a "worthy gentleman," indicating that he is respected and esteemed by his peers.
In this scene, King Duncan expresses his gratitude and admiration for the hospitality of Macbeth's home, praising its pleasant atmosphere and welcoming hosts. Lady Macbeth, on the other hand, uses strategic manipulation to convince Macbeth to seize power by suggesting he lacks courage and masculinity. While Duncan's words highlight genuine kindness and appreciation, Lady Macbeth's words reveal her ruthless ambition and willingness to manipulate for personal gain.
Well, if by this you mean how do we know that Macbeth killed Duncan, his line in Act 2 Scene 2 "I have done the deed" is pretty clear. If you mean does he feel guilty about doing it, how about "This is a sorry sight" which he says while looking at his bloody hand shortly after.
Macbeth does the things he does(like kill Duncan) because Macbeth is manipulated and coaxed by Lady Macbeth to do them. On his own, he would not have done so even though he was ambitious. Lady Macbeth, does the manipulating and all the cruel lines that she says are of her own accord. Nobody forces her, she choses to become evil while Macbeth is forced to become evil.
Duncan's grooms, who he and Lady Macbeth have framed for the murder of Duncan. He claims to have been infuriated at their apparent guilt, when in fact he just wanted to shut them up.
Duncan's older son Malcolm. He is named Prince of Cumberland in Act I, Scene 5, Lines 44-45.
The person with the most lines in the play is macbeth
The sense of sight is appealed to in these lines from Macbeth.
Macbeth himself suspects his own actions and intentions. In Act II, after he murders King Duncan, Macbeth starts to feel overwhelming guilt and paranoia. He hears a voice that says, "Macbeth shall sleep no more" and he becomes consumed by fear and guilt, indicating his inner suspicion.