English resources/Macbeth/Banquo
He hears the same witches and does nothing. He suspects Macbeth. Macbeth has him killed. He comes back as a ghost.

6 quotes by or about Banquo, in the order they happen.
Lesser than Macbeth and greater
Witches · Act 1, Scene 3 · fate and free will · the supernatural
The witches tell Banquo he is lower than Macbeth, but higher too. His sons will be kings.
Thou shalt get kings, though thou be none
Witches · Act 1, Scene 3 · fate and free will · kingship
Banquo will never be king. But his children will. Macbeth cannot forget this.
The instruments of darkness tell us truths, Win us with honest trifles, to betray 's In deepest consequence
Banquo · Act 1, Scene 3 · the supernatural · appearance and reality
Banquo sees the trick. The witches tell small true things so you believe one big lie.
Thou hast it now--king, Cawdor, Glamis, all As the Weird Women promised, and I fear Thou played'st most foully for 't
Banquo · Act 3, Scene 1 · kingship · fate and free will · guilt
Banquo sees it. Macbeth has everything the witches said. He got it by murder.
Upon my head they placed a fruitless crown And put a barren scepter in my grip
Macbeth · Act 3, Scene 1 · kingship · fate and free will
Macbeth has a crown but no son to give it to. That eats him.
Thou canst not say I did it. Never shake Thy gory locks at me
Macbeth · Act 3, Scene 4 · guilt · the supernatural
Macbeth sees Banquo's ghost at dinner. No one else can. They see a king going mad.