"Here's our chief guest," (III. I. 11). Macbeth calls Banquo his most important guest while in his head, Macbeth is planning to murder Banquo.
"We hear our bloody cousins are bestowed/ In England and in Ireland, not confessing/ Their cruel parricide, filling their hearers/ With strange invention," (III. I. 33-36). Macbeth is lying to Banquo and pretending to not be the one who murdered Duncan.
"But of that tomorrow, /When therewithal we shall have cause of state/Craving us jointly," (III. I. 36-38). Macbeth tells Banquo that they will talk more the next day, but Macbeth is planning to kill Banquo that night.
"Know/ That it was he, in the times past, which held you/ So under fortune, which you thought had been/Our innocent self," (III. I. 81-84). Macbeth is making up lies about Banquo in order to get the murderers to hate him too. However, it is Macbeth that has done all the cruel deeds.
"Come on, gentle my lord,/ Sleek o'er your rugged looks. Be bright and jovial/ Among your guests tonight," (III. II. 29-31). Lady Macbeth puts on a calm face for Macbeth while she herself is plagued by anxiety after the murder of Duncan.