Answer:
Macbeth who acts like he is a true supporter of King Duncan but shows his treachery when he murders the king to take his place.
Step-by-step explanation:
From the play Macbeth by William Shakespeare, the recurring motif “Fair is foul, and foul is fair” as said by the witches at the beginning of the play means that people are not all they appear to be because someone who appears to be "fair" could actually be evil and "foul" just as Macbeth himself showed.