What I find interesting is that even Tom Bombadil has taken an "oath" (if oath you can call it) which results in the saving of the hobbits from Old Man Willow.
Quote:
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Each year at summer's end I go to find them for her...
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I know this is more a custom than an actual oath, but still, if Tom wouldn't have made this promise/oath/custom to get water-lilies for his fair Goldberry he wouldn't have been there to save the hobbits and their quest would have ended quite short.