Is the word "Sith" mentioned anywhere in the OT?

So I've been racking my brain for a while trying to recall if the word "Sith" is mentioned in the original trilogy, or if it was first coined during the Phantom Menace or any media before it. In any case, could someone tell me when the word "Sith" was first mentioned? via /r/StarWars https://ift.tt/3mNC5nH