Latin American or Spanish Proverbs or Fables?

I am wondering if there are any common Spanish or Latin American fables with a similar moral to "The Boy Who Cried Wolf", that is, something about lying, how liars can tell the truth without being believed, etc.
A proverb or a saying would also work.
It would be great if you could also provide the country/countries or region where the phrase or fable is common.

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