Bava Batra 39: The Owner's Protest (Details)

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Querying before how many people did Rabbi Yochanan require for an owner to protest that he wasn't giving up his property -- a dispute: either 2 or 3. Perhaps there's a parallel to "lishna bisha," regarding malicious speech before 3 people. Also, the owner's protest -- does it have to be every 3 years?