In We're in for a Bad Spell (1965) Samantha helps a mortal who has had a 200 year old curse put on him. She tells him that he is "bewitched" and he says that he believes her because he is from Salem, Massachusetts.
This was the second episode in which the actual word "bewitched" is uttered in the episode. Samantha says it to Larry Tate in a scene at the office.